CN116127819A - Method for generating cohesive force unit, computer device and storage medium - Google Patents

Abstract

The application discloses a method for generating cohesive force units, computer equipment and a storage medium, and belongs to the technical field of computers. The method comprises the following steps: obtaining a first finite element model of a target structural member, generating a plurality of surface units of each target unit in m target units included in the first finite element model, determining n repeated surface unit pairs from the surface units, and generating n cohesive force units according to the n repeated surface unit pairs. The application can generate n cohesive force units in batches.

Description

Method, computer device and storage medium for generating cohesive force unit

technical field

The present application relates to the field of computer technology, in particular to a method for generating cohesive force units, computer equipment and storage media.

Background technique

There are inevitably various defects in materials, which cause structural fractures in engineering. At present, the cohesion model based on elastic-plastic fracture mechanics is widely used to calculate the damage and fracture process of material interface. The cohesion model avoids the singularity of crack tip stress in linear elastic fracture mechanics, and calculates the stress and fracture energy during the cracking process, making it widely valued and used in the fields of crack propagation, composite material delamination and debonding, and device bonding. .

The cohesion model is implemented by inserting zero-thickness cohesion elements in the finite element model of the structural member. However, currently there are few effective methods available for batch insertion of cohesive force elements in the finite element model of structural parts, so a method for batch generation of cohesive force elements based on the finite element model of structural parts is urgently needed.

Contents of the invention

The present application provides a method for generating a cohesive force unit, a computer device and a storage medium, which can generate multiple cohesive force units in batches. Described technical scheme is as follows:

In a first aspect, a method for generating cohesive force elements is provided. In this method, a first finite element model is obtained, the first finite element model is a finite element model of a target structural member, the first finite element model includes m target units, and m is an integer greater than or equal to 2. Afterwards, generate a plurality of surface units of each target unit in the m target units, determine n repeated surface unit pairs from the multiple surface units of each target unit in the m target units, and each of the n repeated surface unit pairs The repeated surface unit pairs include two surface units with repeated positions, and n is an integer greater than or equal to 2. Finally, n cohesion elements are generated from the n repeated face element pairs.

Any one of the m target units has unit identification and node information. The node information of an object unit includes the node identification of each node among all the nodes constituting the object unit. A surface unit has a unit identifier and node information, and the node information of a surface unit includes the node identifier of each node among all the nodes constituting the surface unit.

In this application, after obtaining the first finite element model of the target structure, multiple surface units for each of the m target units included in the first finite element model can be generated, and then n number of surface units can be determined from these surface units Repeat the surface unit pairs, and finally generate n cohesive force units according to the n repeated surface unit pairs. In this way, n cohesive force units can be generated in batches.

Optionally, the operation of generating multiple surface units for each of the m target units may be: obtaining the unit identification of each of the m target units; according to the unit of any one of the m target units To identify, use the surface element generation function to generate multiple surface elements of this target element.

In this application, according to the unit identification of any target unit, multiple surface units of this target unit can be generated simply and quickly by using the surface unit generation function.

Optionally, a second finite element model may also be generated, and the second finite element model includes multiple surface units of each target unit in the m target units. In this case, the operation of determining n repeated surface unit pairs from multiple surface units of each target unit in the m target units can be: display the second finite element model; Find n repeated surface element pairs in all surface elements in the two finite element models.

In this application, the repeated unit search function can be used to simply and quickly search for n repeated surface unit pairs from all surface units in the displayed second finite element model.

Optionally, before generating n cohesion units based on n repeated surface unit pairs, a first set can also be created, the first set includes m first subsets corresponding to m target units one-to-one, and m first subsets Each first subset in the set includes a unit identification of the corresponding target unit and a unit identification of each of the plurality of surface units of the corresponding target unit. Create a second set, the second set includes n second subsets corresponding to n repeated surface unit pairs one-to-one, and each second subset in the n second subsets includes two of the corresponding repeated surface unit pairs Element ID for each of the area elements in the area.

In this case, the operation of generating n cohesive force units based on n repeated surface unit pairs may be: generating n cohesive force units based on the first set and the second set. In this application, n cohesion units can be generated simply and quickly according to the first set and the second set.

Optionally, the operation of generating n cohesion units according to the first set and the second set may be: according to the m first subsets in the first set, combine the surface unit of each target unit in the m target units with other The surface unit of the target unit is separated to update the node information of the separated surface unit; obtain n groups of node information corresponding to the n second subsets in the second set, and each group of n groups of node information The node information includes the node information of the surface unit identified by each of the two unit identifiers included in the corresponding second subset; n cohesion units are generated according to the n sets of node information.

In this application, the surface unit of each target unit in the m target units is separated from the surface units of other target units, and then according to the Nodal information can accurately generate cohesive force elements.

Optionally, the operation of obtaining n groups of node information corresponding to the n second subsets in the second set may be: for any second subset among the n second subsets, obtain the second The node information of the surface unit identified by each unit ID in the two unit IDs included in the subset to obtain the two node information; determine the correspondence between the node IDs in the two node information; according to For the corresponding relationship between the node identifiers in the two node information, the node identifiers in the two node information are sequentially added to a group of node information corresponding to a second subset.

The multiple node identifiers in one of the two node information are in one-to-one correspondence with the multiple node identifiers in the other node information. The correspondence between the node identifiers in the two node information is used to indicate that a node identifier in one node information of the two node information corresponds to a node identifier in the other node information. The two nodes identified by the corresponding two node IDs are the two closest nodes among the nodes identified by all the node IDs in the two node information, and the corresponding two node IDs The positions of the two identified nodes are the same.

Optionally, according to the correspondence between the node identifiers in the two node information, add the node identifiers in the two node information to a group of nodes corresponding to a second subset in sequence The operation in the information can be: adding all node identifiers in one node information of the two node information to this group of node information in sequence; The corresponding relationship between the order and the node identifiers in the two node information, sort all the node identifiers in the other node information in the two node information; the sorted another node All node identifiers in the information are added to this set of node information in sequence.

For example, when n cohesion units are generated according to n sets of node information, for any set of node information in the n sets of node information, the first half of the node identifiers in the set of node information can be sequentially connected multiple nodes, and sequentially connect multiple nodes identified by the second half of the node identifiers in this set of node information, and connect the multiple nodes identified by the first half of the node identifiers in this set of node information one by one The number of nodes identified by the point and the second half of the node ID is obtained to obtain a cohesive force unit, and then a unit ID is assigned to the cohesive force unit.

Optionally, after n cohesive force units are generated according to n groups of node information, a third finite element model can also be generated, and the third finite element model includes n cohesive force units; body properties are set for the first finite element model, and Three finite element models set cohesion properties.

Wherein, the body properties of the first finite element model are related properties of the target structural member, such as density, elastic modulus, Poisson's ratio, etc. may be included. The cohesive force attribute of the third finite element model is a related property of the cohesive force unit, for example, may include tensile stiffness, shear stiffness, tensile strength, shear strength, tensile fracture energy, shear fracture energy, and the like. After setting the body attribute for the first finite element model and the cohesion attribute for the third finite element model, the cracking phenomenon can be simulated based on the first finite element model and the third finite element model.

A second aspect provides a device for generating a cohesive force unit, and the device for generating a cohesive force unit has the function of implementing the behavior of the method for generating a cohesive force unit in the above first aspect. The device for generating a cohesive force unit includes at least one module, and the at least one module is used to implement the method for generating a cohesive force unit provided in the first aspect above.

In the third aspect, there is provided a device for generating a cohesive force unit, the structure of the device for generating a cohesive force unit includes a processor and a memory, and the memory is used to store and support the device for generating a cohesive force unit to perform the above-mentioned first aspect. A program of the method for generating cohesive force units, and storing data involved in implementing the method for generating cohesive force units described in the first aspect above. The processor is configured to execute programs stored in the memory. The means for generating a cohesion unit may further include a communication bus for establishing a connection between the processor and the memory.

In a fourth aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the method for generating a cohesive force unit described in the above-mentioned first aspect.

A fifth aspect provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the method for generating cohesive force units described in the first aspect above.

The technical effects obtained by the above-mentioned second aspect, third aspect, fourth aspect and fifth aspect are similar to those obtained by the corresponding technical means in the above-mentioned first aspect, and will not be repeated here.

Description of drawings

FIG. 1 is a schematic structural diagram of a computer device provided by an embodiment of the present application;

Fig. 2 is a flow chart of a method for generating a cohesive force unit provided by an embodiment of the present application;

Fig. 3 is a schematic diagram of a finite element model of a target structure provided by the embodiment of the present application;

Fig. 4 is a schematic diagram of the finite element model of the first target structure and the finite element model of the cohesion unit provided by the embodiment of the present application;

Fig. 5 is a schematic diagram of the finite element model of the second target structure and the finite element model of the cohesion unit provided by the embodiment of the present application;

Fig. 6 is a schematic diagram of the finite element model of the third target structural member and the finite element model of the cohesive force unit provided by the embodiment of the present application;

Fig. 7 is a schematic diagram of the finite element model of the fourth target structure and the finite element model of the cohesion unit provided by the embodiment of the present application;

Fig. 8 is a schematic diagram of a finite element model of glue cracking provided by an embodiment of the present application;

Fig. 9 is a schematic structural diagram of a device for generating a cohesive force unit provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manner of the present application will be further described in detail below in conjunction with the accompanying drawings.

It should be understood that the "plurality" mentioned in this application means two or more. In the description of this application, unless otherwise specified, "/" means or means, for example, A/B can mean A or B; "and/or" in this article is just a description of the relationship between associated objects, It means that there can be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in order to clearly describe the technical solution of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference.

Phrases such as "one embodiment" or "some embodiments" described in this application mean that a particular feature, structure, or characteristic described by the embodiment is included in one or more embodiments of the present application. Thus, appearances of "in one embodiment," "in some embodiments," "in other embodiments," "in other embodiments," etc. in various places in this application are not necessarily All refer to the same embodiment, but mean "one or more but not all embodiments" unless specifically stated otherwise. In addition, the terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless specifically stated otherwise.

The application scenarios involved in the embodiments of the present application are described below.

There are inevitably various defects in materials, which cause structural fractures in engineering. For example, there is a large amount of structural glue inside the mobile phone, and the parts are bonded by glue. In the study of mechanical or environmental reliability, glue cracking is a common failure mode. Glue cracking can be divided into glue interface debonding, glue body cracking, and a combination of the two. . With the diversification and development of material structures, traditional fracture mechanics can no longer meet the research needs of ductile cracking and material interface cracking. The cohesive zone model (CZM) based on elastic-plastic fracture mechanics has been widely used to calculate the damage and fracture process of material interface.

The cohesion model avoids the singularity of crack tip stress in linear elastic fracture mechanics, and calculates the stress and fracture energy during the cracking process, making it widely valued and used in the fields of crack propagation, composite material delamination and debonding, and device bonding. . The cohesion model is realized by inserting zero-thickness cohesion elements (hereinafter referred to as cohesion elements) in the finite element model of the structural member. The cohesive force element can withstand tensile and shear strains, but cannot generate any stress. Combining the traction-separation failure criterion perpendicular to the upper and lower surfaces can better simulate the fracture and failure of materials.

However, there are currently few effective methods available for batch insertion of cohesion elements in the finite element model of structural parts. To this end, the embodiment of the present application provides a method for generating cohesive force units, which can generate multiple surface units of each solid unit in the multiple solid units included in the finite element model of the structure, and then determine multiple repeated surface units Yes, finally generate multiple cohesion elements based on multiple repeated surface element pairs, so that multiple cohesion elements can be generated in batches.

The computer equipment involved in the embodiments of the present application will be described below.

FIG. 1 is a schematic structural diagram of a computer device provided by an embodiment of the present application. Referring to FIG. 1 , the computer device includes at least one processor 101 , a communication bus 102 , a memory 103 and at least one communication interface 104 .

The processor 101 may be a microprocessor (including a central processing unit (central processing unit, CPU), etc.), an application-specific integrated circuit (application-specific integrated circuit, ASIC), or may be one or more integrated circuit for program execution.

Communication bus 102 may include a path for communicating information between the components described above.

The memory 103 can be a read-only memory (read-only memory, ROM), a random access memory (random access memory, RAM), an electrically erasable programmable read-only memory (electrically erasable programmable read-Only memory, EEPROM), an optical disc (including only CD-ROM (compact disc read-only memory, CD-ROM, compact disc, laser disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage medium or other magnetic storage device, or can be used to carry or store instructions or Desired program code in the form of a data structure and any other medium capable of being accessed by a computer, but not limited thereto. The memory 103 may exist independently, and is connected to the processor 101 through the communication bus 102 . The memory 103 can also be integrated with the processor 101 .

The communication interface 104 uses any device such as a transceiver for communicating with other devices or communication networks, such as Ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area network, WLAN), etc.

In a specific implementation, as an embodiment, the processor 101 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 1 .

In a specific implementation, as an embodiment, the computer device may include multiple processors, such as the processor 101 and the processor 105 shown in FIG. 1 . Each of these processors can be a single-core processor or a multi-core processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data such as computer program instructions.

In a specific implementation, as an embodiment, the computer device may further include an output device 106 and an input device 107 . Output device 106 is in communication with processor 101 and may display information in a variety of ways. For example, the output device 106 may be a liquid crystal display (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a cathode ray tube (cathode ray tube, CRT) display device, or a projector (projector), etc. The input device 107 communicates with the processor 101 and can receive user input in various ways. For example, the input device 107 may be a mouse, a keyboard, a touch screen device, or a sensor device, among others.

The above-mentioned computer equipment may be a general computer equipment or a special computer equipment. In a specific implementation, the computer device may be a desktop computer, a portable computer, a network server, a palmtop computer, a mobile phone, a tablet computer, a wireless terminal device, a communication device or an embedded device, and the embodiment of the present application does not limit the type of the computer device.

Wherein, the memory 103 is used to store the program code 110 for executing the solution of the present application, and the processor 101 is used to execute the program code 110 stored in the memory 103 . The computer device can implement the method for generating a cohesive force unit provided in the embodiment of FIG. 2 below through the processor 101 and the program code 110 in the memory 103 .

FIG. 2 is a flow chart of a method for generating cohesive force units provided by an embodiment of the present application, and the method is applied to the computer device described in the embodiment of FIG. 1 above. Referring to Figure 2, the method comprises the following steps:

Step 201: The computer equipment obtains the first finite element model.

The first finite element model is a finite element model of the target structural member. The target structural part is the structural part whose cracking or debris generation needs to be simulated later. The target structural member may be a composite material or a single material, which is not limited in this embodiment of the present application. For example, the target structural member may be glue, such as AA glue often used in mobile phones.

The first finite element model is a simulation model of the target structural part, and the first finite element model has geometric characteristics and unit forms of the target structural part. The first finite element model is a grid model, and the first finite element model includes m target units, all of which are solid units, and m is an integer greater than or equal to 2. Each of the m target units is a polyhedron unit, and each of the m target units has the same number of faces. Each of the m target units is composed of multiple nodes, and each of the m target units has the same number of nodes.

Any one of the m target units has a unit identifier (including but not limited to a unit number) and node information. The node information of a target unit includes the node identifier (including but not limited to the node number) of each node among all the nodes constituting the target unit. For example, if the target unit is a hexahedron unit, then the target unit can include 8 nodes; if the target unit is a pentahedron unit, then the target unit can include 5 nodes; if the target unit is a tetrahedron unit, then the target unit can include 4 knots.

Step 202: The computer device generates multiple surface units for each of the m target units included in the first finite element model.

The target unit is a polyhedral unit, so the target unit can have a corresponding surface unit, and the surface unit is composed of multiple nodes. For example, if the target unit is a hexahedron unit, then the target unit has 6 surface units, and any one surface unit can include 4 nodes; if the target unit is a pentahedron unit, then the target unit has 5 surface units, and any one surface unit It can include 3 or 4 nodes; if the target unit is a tetrahedron unit, the target unit has 4 surface units, and any surface unit can include 3 nodes. A surface unit has a unit identifier and node information, and the node information of a surface unit includes the node identifier of each node among all the nodes constituting the surface unit.

Optionally, the operation of step 202 may be: the computer device obtains the unit identification of each target unit in the m target units; generates multiple surface units for each target unit according to the unit identification of each target unit in the m target units , specifically, according to the unit identifier of any one of the m target units, the surface unit generation function can be used to generate multiple surface units of this target unit.

For example, when the computer device obtains the unit identification of each target unit in the m target units, it can obtain the unit identification of each target unit in the m target units included in the first finite element model by traversing the first finite element model, That is, m unit identifiers are obtained, and a third set may be created, and the m unit identifiers are stored in the third set.

For example, when the computer device generates multiple surface units of each target unit according to the unit identification of each target unit in the m target units, it can traverse each unit identification in the m unit identifications in the third set, and for the current traversal According to the unit identification obtained, the area unit generation function can be used to quickly generate multiple area units of the target unit identified by the unit identification. Among them, the surface element generation function is a function for generating surface elements of solid elements. For example, the surface unit generating function may be a find face function.

In this case, every time the computer device traverses to a unit identifier in the third set, after generating multiple surface units according to the unit identifier, a fourth set can be created, and each of the multiple surface units newly generated this time The unit identifiers of surface units are stored in a fourth set, and then a first subset is created, and this unit identifier and all unit identifiers in the fourth set are stored in the first subset. In this case, after traversing all the unit identifiers in the third set, m first subsets will be obtained, and the m first subsets correspond to m target units one by one, and each of the m first subsets The first subset includes the unit identification of the corresponding target unit and the unit identification of each of the plurality of surface units of the corresponding target unit. Afterwards, the computer device may create a first set comprising the m first subsets.

In addition, the computer device can also generate a second finite element model. In this case, every time a unit identifier in the third set is traversed, after multiple surface units are generated according to this unit identifier, each surface unit in the multiple surface units newly generated this time can be added to the second in the finite element model. In this case, after traversing all the unit identifiers in the third set, the second finite element model will include multiple surface units for each of the m target units.

Step 203: The computer device determines n repeated surface unit pairs from the multiple surface units of each of the m target units, where n is an integer greater than or equal to 2.

Each of the n repeated face unit pairs includes two face units whose positions are repeated.

Optionally, the operation of step 203 may be: displaying the second finite element model; determining n repeated surface unit pairs from all surface units in the displayed second finite element model, specifically, the repeated unit search function may be used to obtain Quickly find out n repeated surface element pairs from all surface elements in the displayed second finite element model.

The repeating unit search function is a function for finding a repeating unit from among the units included in the displayed finite element model. For example, the repeat unit search function can be a duplicate function.

In this case, each time the computer device determines a repeated surface unit pair, a second subset can be created, and the unit identification of each of the two surface units included in the newly determined repeated surface unit pair is stored in This second subset. After determining all the repeated surface unit pairs (that is, n repeated surface unit pairs), n second subsets are obtained, and the n second subsets are in one-to-one correspondence with n repeated surface unit pairs. Each second subset of the two subsets includes a unit identifier for each of the two area units included in the corresponding repeated pair of area units. Afterwards, the computer device may create a second set comprising n second subsets.

Step 204: The computer device generates n cohesive force units according to the n repeated surface unit pairs.

For any one repeated surface unit pair among the n repeated surface unit pairs, a cohesive force unit can be generated between two surface units included in the repeated surface unit pair, so that n cohesive force units can be generated in batches.

Optionally, the operation of step 204 may include the following two methods:

The first method: For any one of the n repeated surface unit pairs, the computer device generates a new node at the position of each node in all the nodes of one surface unit in the repeated surface unit pair point, assign all the newly generated nodes to the other surface unit in this repeated surface unit pair, and build a cohesive force unit through all the nodes of the two surface units in this repeated surface unit pair.

As an example, when a computer device builds a cohesion unit through all the nodes of the two surface units in the repeated surface unit pair, it can respectively connect all the nodes of each surface unit in the two surface units in sequence, and then connect them one by one Nodes in the same position in the two surface elements to obtain a cohesive element, and then assign an element ID to this cohesive element.

The second way: the computer device generates n cohesion units according to the first set and the second set.

In this way, the computer device can simply and quickly generate n cohesion units directly according to the first set and the second set.

Optionally, the operation of the computer device to generate n cohesion units according to the first set and the second set may be: according to the m first subsets in the first set, the surface unit of each target unit in the m target units Separate from the surface units of other target units to update the node information of the separated surface units; obtain n groups of node information corresponding to n second subsets in the second set one-to-one, among the n groups of node information Each set of node information includes node information of surface elements identified by each of the two unit identifiers included in the corresponding second subset; n cohesion units are generated according to n sets of node information.

In the embodiment of this application, the surface unit of each target unit among the m target units is separated from the surface units of other target units, and then two surface The node information of the unit can accurately generate the cohesive force unit.

Exemplarily, when the computer device separates the surface units of each target unit in the m target units from the surface units of other target units according to the m first subsets in the first set, the m subsets in the first set can be traversed The first subset, for a first subset currently traversed, the unit separation function can be used to quickly separate the surface units of the target unit corresponding to the first subset from the surface units of other target units. Wherein, the unit separation function is used to separate two repeated units, for example, the unit separation function may be a detach function. Separating one surface unit from another surface unit refers to generating a new node at the position of each node in all nodes of this one surface unit, and assigning all newly generated nodes to the other surface unit , so that the node information of the separated surface unit will be updated.

For example, when the computer device obtains n groups of node information corresponding to n second subsets in the second set, for any second subset in the n second subsets, the second subset is obtained Include the node information of the surface unit identified by each unit ID in the two unit IDs to obtain the two node information; determine the correspondence between the node IDs in the two node information; according to the two The corresponding relationship between the node identifiers in the two node information, and add the node identifiers in the two node information to the set of node information corresponding to the second subset in order.

The multiple node identifiers in one of the two node information are in one-to-one correspondence with the multiple node identifiers in the other node information. The correspondence between the node identifiers in the two node information is used to indicate that a node identifier in one node information of the two node information corresponds to a node identifier in the other node information. The two nodes identified by the corresponding two node IDs are the two closest nodes among the nodes identified by all the node IDs in the two node information, and the corresponding two node IDs The positions of the two identified nodes are the same.

Wherein, the computer device adds the node identifiers in the two node information to a group of nodes corresponding to the second subset in sequence according to the correspondence between the node identifiers in the two node information information, you can first add all the node identifiers in one of the two node information to the set of node information corresponding to the second subset in order, and then according to the node information The order of all node identifiers and the corresponding relationship between the node identifiers in the two node information, sort all the node identifiers in the other node information in the two node information, and sort the sorted All node identifiers in the other node information are added to this group of node information in sequence.

For example, when the computer device generates n cohesive force units according to n sets of node information, for any set of node information in the n sets of node information, the first half of the node identifiers in the set of node information can be sequentially connected The multiple nodes identified, and sequentially connect the multiple nodes identified by the second half of the node identifiers in this group of node information, and connect the multiple nodes identified by the first half of the node identifiers in this group of node information one by one node and the multiple nodes identified by the second half node ID to obtain a cohesive force unit, and then assign a unit ID to this cohesive force unit.

Further, after the computer device generates n cohesive force units, it can also generate a third finite element model (also called a cohesive force model), and the third finite element model includes n cohesive force units. Afterwards, you can set the body properties for the first FE model, and the cohesion properties for the third FE model. Wherein, the body properties of the first finite element model are related properties of the target structural member, such as density, elastic modulus, Poisson's ratio, etc. may be included. The cohesive force attribute of the third finite element model is a related property of the cohesive force unit, for example, may include tensile stiffness, shear stiffness, tensile strength, shear strength, tensile fracture energy, shear fracture energy, and the like.

Furthermore, computer equipment can also define working conditions and generate other finite element models to complete pre-processing.

Working conditions are used to indicate the connection relationship between the target structure and other components in the subsequent simulation process, and indicate the operations that need to be performed in the subsequent simulation process.

After the pre-processing is completed, multiple finite element models are obtained, including the first finite element model, the third finite element model and finite element models of other related components. Wherein, the third finite element model can be embedded in the first finite element model. Afterwards, computer equipment can perform simulation calculations based on the obtained multiple finite element models to simulate phenomena such as cracking and debris generation of target structural parts.

In the embodiment of the present application, after obtaining the first finite element model of the target structure, multiple surface units of each of the m target units included in the first finite element model can be generated, and then determined from these surface units n repeated surface unit pairs, and finally generate n cohesive force units according to the n repeated surface unit pairs. In this way, n cohesive force units can be generated in batches.

It should be noted that the method for generating the cohesive force unit provided in the embodiment of the present application can be run in finite element analysis software. The finite element analysis software may include Hypermesh software, Abaqus software, etc., which are not limited in this embodiment of the present application.

The method for generating the cohesive force unit provided in the embodiment of the present application can insert a zero-thickness cohesive force unit between any two units in the finite element model of the target structural member, and then use the cohesive force unit to simulate cracking and debris generation of the target structural member.

Taking the unit ID as the unit number and the node ID as the node number as an example, a possible implementation of the method for generating cohesive force units provided in the embodiment of the present application is illustrated below. The method may include the following operations:

Step 1: Create the finite element model Component (hereinafter referred to as Comp) of the target structure in the finite element analysis software and name it glue.

For example, as shown in Figure 3, the created finite element model Comp glue of the target structure can be a three-layer hexahedral mesh model, the finite element model Comp glue includes m target units, and each target unit in the m target units are hexahedral units.

The second step: Insert n cohesion elements into the finite element model Comp glue, which may specifically include the following steps (1) to (7). Exemplarily, the operation of the second step can be automatically completed in the finite element analysis software based on the TCL/tk Script script written in Tool Command Language (Tool Command Language, TCL). Of course, the operation of the second step can also be based on the script written in other languages. The script is automatically completed in the finite element analysis software, which is not limited in this embodiment of the present application.

(1) Traverse the finite element model Comp glue to obtain the unit number of each target unit in the finite element model Comp glue, create a collection and name it list_elements, and store the unit number of each target unit in all the obtained target units to the collection list_elements.

In this case, the set list_elements includes the element number of each target element in all target elements in the finite element model Compglue.

For example, if the finite element analysis software is Hypermesh software, all the collections described in the embodiments of the present application may be lists. If the finite element analysis software is other software, the collection described in the embodiment of the present application may be implemented in other forms.

(2) Traverse each element number in the set list_elements to generate multiple surface elements for each target element.

In this case, create a finite element model Comp and name it interface to store all the surface elements generated. If you traverse to the first unit number in the collection list_elements, you can automatically create a finite element model Comp and name it face to store the newly generated surface unit, and then you can use find face according to the first unit number The function generates multiple surface units of the target unit identified by the first unit number, stores the newly generated multiple surface units to the finite element model Comp face, and stores the newly generated multiple surface units to the finite element model Comp interface, then create a collection and name it list detach_face_ele, store the unit number of each surface unit in all surface units in the finite element model Compface to the collection list detach_face_ele, create a new subset and name it list detach_small_list, and set the first A unit number and all unit numbers in the set list detach_face_ele are stored in the subset list detach_small_list, and then continue to traverse the next unit number in the set list_elements. If you traverse to other unit numbers in the collection list_elements except the first unit number, you can use the find face function to generate multiple surface units of the target unit identified by the unit number according to the currently traversed unit number, and add the new The generated surface units are updated and stored in the finite element model Compface, that is, the newly generated surface units are used to replace all previously stored surface units in the finite element model Comp face, and the newly generated surface units are The unit is stored in the finite element model Comp interface, and then the unit number of each surface unit in all surface units in the finite element model Comp face is updated and stored in the set list detach_face_ele, that is, each of all surface units in the finite element model Comp face is used Replace the cell numbers previously stored in the set list detach_face_ele with the unit numbers of each surface unit, create a new subset and name it list detach_small_list, and store the currently traversed unit numbers and all unit numbers in the set list detach_face_ele to the subset list detach_small_list , and then continue to traverse the next cell number in the collection list_elements. In this way, after traversing all the unit numbers in the set list_elements, you will get multiple subsets list detach_small_list corresponding to all the unit numbers in the set list_elements one-to-one, and get the finite element model Comp interface, the finite element model Comp interface includes the generated All surface elements. In this case, delete the finite element model Comp face and the set list detach_face_ele, and create a set and name it detach_ele_list, and store the multiple subsets list detach_small_list in the set detach_ele_list in turn.

(3) Determine multiple repeated surface unit pairs in all generated surface units, and a repeated surface unit pair includes two surface units with repeated positions.

In some embodiments, the finite element model Comp interface can be displayed, and the duplicate function can be used to find multiple duplicate surface unit pairs from the surface units included in the displayed finite element model Comp interface. Whenever a duplicate surface element pair is found, create a new subset and name it list duplicate_ele_list, and store the unit number of each surface element in the two surface elements in the duplicate surface element pair to the subset list duplicate_ele_list. After finding all the duplicate surface element pairs, create a set and name it duplicate_element_list, and store all the created subset list duplicate_ele_list in the set duplicate_element_list in turn.

(4) Traversing the subset list detach_small_list in the set detach_ele_list to perform detachment operations on the surface units of each target unit and the surface units of other target units.

In this case, for any subset listdetach_small_list in the currently traversed set detach_ele_list, you can use the detach function to separate the surface unit of the target unit corresponding to this subset list detach_small_list from the surface units of other target units. In this case, the node information of the two surface elements identified by the two element numbers in each subset list duplicate_ele_list in the set duplicate_element_list is different, that is, the two surface elements have been separated.

(5) Traverse all subset list duplicate_ele_list in the set duplicate_element_list to obtain n groups of node information.

In this case, for any subset list duplicate_ele_list in the currently traversed set duplicate_element_list, obtain the node information of each of the two surface units identified by the two unit numbers in the subset list duplicate_ele_list. Assuming that the two surface units include surface unit A and surface unit B, the node information of surface unit A is recorded as list1{M1, M2,...,Mk}, and the node information of surface unit B is recorded as list2{N1, N2 , ..., Nk}, then traverse list1 and list2 to find the node numbers of the two nearest nodes, to determine the node number in the node information of surface unit A and the node number in the node information of surface unit B The correspondence between point numbers, assuming that M1 corresponds to N1, M2 corresponds to N2, M3 corresponds to N3, and so on, Mk corresponds to Nk, then create a subset and name it create_cohesive_nodes, and the node information of surface unit A and surface unit B All node numbers in are stored in the subset create_cohesive_nodes1 in sequence, and {M1, M2,..., Mk, N1, N2,..., Nk} are obtained. After traversing all the subset lists duplicate_ele_list in the set duplicate_element_list, obtain multiple subsets create_cohesive_nodes1, create a set and name it list create_cohesive_nodes, and store multiple subsets create_cohesive_nodes1 into the set list create_cohesive_nodes in turn.

(6) Create a finite element model Comp and name it cohesive_zero_elements.

The finite element model Comp cohesive_zero_elements is the finite element model of the cohesive elements.

(7) Traverse all subsets create_cohesive_nodes1 in the set list create_cohesive_nodes to create multiple cohesive units, and store the created multiple cohesive units into the finite element model Compcohesive_zero_elements.

When the cohesive force unit is created according to the subset create_cohesive_nodes1, the corresponding cohesive force unit can be formed according to the nodes identified by the node numbers in the subset create_cohesive_nodes1. Specifically, multiple nodes identified by the first half of the node numbers in the subset create_cohesive_nodes1 can be sequentially connected, and multiple nodes identified by the second half of the node numbers in the subset create_cohesive_nodes1 can be sequentially connected, and connected one by one In the subset create_cohesive_nodes1, multiple nodes identified by the first half of the node numbers and multiple nodes identified by the second half of the node numbers are used to obtain a cohesive force unit, and then a unit number is assigned to the cohesive force unit.

For example, as shown in Figure 4, when the finite element model Comp glue of the target structural part is a layer of hexahedral mesh model shown in (a) in Figure 4, the generated finite element model Comp cohesive_zero_elements of the cohesive force unit It can be shown in (b) diagram in Figure 4.

For another example, as shown in Figure 5, when the finite element model Comp glue of the target structural member is the three-layer hexahedral mesh model shown in (a) in Figure 5, the generated finite element model Comp of the cohesive force unit cohesive_zero_elements can be shown in (b) diagram in Figure 5.

For another example, as shown in Figure 6, when the finite element model Comp glue of the target structure is the pentahedral mesh model shown in (a) in Figure 6, the generated finite element model Comp cohesive_zero_elements of the cohesive force unit It can be shown in (b) diagram in Figure 6.

For example, as shown in Figure 7, when the finite element model Comp glue of the target structure is the tetrahedral mesh model shown in (a) in Figure 7, the generated finite element model Comp cohesive_zero_elements of the cohesive force unit It can be shown in (b) diagram in Figure 7.

Step 3: Assign body attributes to the finite element model Comp glue of the target structural member, and assign cohesive force attributes to the finite element model Comp cohesive_zero_elements of the cohesive force unit.

Exemplarily, the body properties of the finite element model Compglue of the target structural member may include density, elastic modulus, Poisson's ratio, and the like. The cohesive properties of the finite element model Comp cohesive_zero_elements of the cohesive force element can include tensile stiffness, shear stiffness, tensile strength, shear strength, tensile fracture energy, shear fracture energy, etc.

Step 4: Define the working conditions and other finite element models Comp, and complete the pre-processing.

Working conditions are used to indicate the connection relationship between the target structure and other components in the subsequent simulation process, and indicate the operations that need to be performed in the subsequent simulation process.

After the pre-processing is completed, multiple finite element models are obtained, including the finite element model Comp glue of the target structural part, the finite element model Comp cohesive_zero_elements of the cohesive force unit, and the finite element model Comp of other related components. Among them, the finite element model Comp cohesive_zero_elements of the cohesive force unit is embedded in the finite element model Comp glue of the target structure. Afterwards, the obtained multiple finite element models can be submitted to other software for simulation.

For example, as shown in Fig. 8, the established simplified finite element model of glue cracking may include the finite element model of the bonded object and the finite element model of the glue layer inserted with cohesive force elements. The working condition is: the lower end of the adhered object is fixed, and an upward pulling force is applied to the upper end to simulate the cracking phenomenon of the adhesive layer. Afterwards, the finite element model of glue cracking can be submitted to other software for calculation to simulate the phenomenon of uniaxial tensile glue body cracking.

Fig. 9 is a schematic structural diagram of a device for generating a cohesive force unit provided by an embodiment of the present application. The device can be implemented by software, hardware or a combination of the two as part or all of a computer device. The computer device can be the above-mentioned Fig. 1 The computer equipment described in the embodiment. Referring to Figure 9, the device includes:

An acquisition module 901, configured to acquire a first finite element model, the first finite element model is a finite element model of a target structural member, the first finite element model includes m target units, and m is an integer greater than or equal to 2;

The first generation module 902 is used to generate a plurality of surface units of each target unit in the m target units;

A determination module 903, configured to determine n repeated surface unit pairs from the multiple surface units of each target unit in the m target units, and each repeated surface unit pair in the n repeated surface unit pairs includes two surfaces with repeated positions unit, n is an integer greater than or equal to 2;

The second generating module 904 is configured to generate n cohesion force units according to n repeated surface unit pairs.

Optionally, the first generating module 902 is used for:

Obtain the unit identifier of each target unit in the m target units;

According to the unit identification of any one of the m target units, use the surface unit generation function to generate multiple surface units of this one target unit.

Optionally, the device also includes:

The third generation module is used to generate the second finite element model, the second finite element model includes a plurality of surface units of each target unit in the m target units;

The determining module 903 is used for:

Display the second finite element model;

Use the duplicate element lookup function to find n duplicate area element pairs from all the area elements in the displayed second finite element model.

Optionally, the device also includes:

The first creation module is used to create a first set, the first set includes m first subsets corresponding to m target units one-to-one, and each first subset in the m first subsets includes the corresponding target unit A unit identification and a unit identification of each area unit in a plurality of area units corresponding to the target unit;

The second creation module is used to create a second set, the second set includes n second subsets corresponding to n repeated surface unit pairs one-to-one, and each second subset in the n second subsets includes a corresponding repetition The element identification of each of the two surface elements included in the surface element pair;

The second generating module 904 is used for:

Generate n cohesion elements from the first set and the second set.

Optionally, the second generation module 904 is used for:

According to the m first subsets in the first set, the surface unit of each target unit in the m target units is separated from the surface units of other target units, so as to update the node information of the separated surface units;

Acquiring n sets of node information corresponding to n second subsets in the second set, each set of node information in the n sets of node information includes each of the two unit identifiers included in the corresponding second subset The node information of the area unit identified by the unit identifier;

Generate n cohesion units according to n groups of node information.

Optionally, the second generation module 904 is used for:

For any one of the n second subsets, obtain the node information of the surface unit identified by each of the two unit IDs included in the second subset, so as to obtain two node information;

Determine the correspondence between the node identifiers in the two node information;

According to the corresponding relationship between the node identifiers in the two node information, the node identifiers in the two node information are sequentially added to a set of node information corresponding to a second subset.

Optionally, the two nodes identified by the corresponding two node identifiers in the correspondence between the node identifiers in the two node information are identified by all the node identifiers in the two node information The two closest nodes among the nodes;

The second generating module 904 is used for:

Add all node identifiers in one of the two node information to a set of node information in sequence;

According to the order of all node identifiers in one node information and the corresponding relationship between the node identifiers in the two node information, sort all the node identifiers in the other node information of the two node information;

Add all node identifiers in another sorted node information to a set of node information in sequence.

Optionally, the device also includes:

A fourth generating module, configured to generate a third finite element model, where the third finite element model includes n cohesive force units;

A setting module is used for setting body properties for the first finite element model, and setting cohesion properties for the third finite element model.

In the embodiment of the present application, after obtaining the first finite element model of the target structure, multiple surface units of each of the m target units included in the first finite element model can be generated, and then determined from these surface units n repeated surface unit pairs, and finally generate n cohesive force units according to the n repeated surface unit pairs. In this way, n cohesive force units can be generated in batches.

It should be noted that: when the device for generating cohesive force units provided by the above-mentioned embodiments generates cohesive force units, it only uses the division of the above-mentioned functional modules for illustration. In practical applications, the above-mentioned functions can be assigned to different functional modules according to needs. To complete means to divide the internal structure of the device into different functional modules to complete all or part of the functions described above.

The functional units and modules in the above-mentioned embodiments can be integrated into one processing unit, or each unit can exist separately physically, or two or more units can be integrated into one unit, and the above-mentioned integrated units can use hardware It can also be implemented in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the embodiments of the present application.

The device for generating the cohesive force unit provided in the above-mentioned embodiment and the embodiment of the method for generating the cohesive force unit belong to the same idea. For the specific working process and technical effects of the unit and module in the above-mentioned embodiment, please refer to the method embodiment part, which is not described here. Let me repeat.

In the above embodiments, all or part may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be accessed from a website, computer, server, or data center Transmission to another website site, computer, server or data center via wired (such as: coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as: infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or may be a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (such as a floppy disk, a hard disk, or a magnetic tape), an optical medium (such as a digital versatile disc (Digital Versatile Disc, DVD)), or a semiconductor medium (such as a solid state disk (Solid State Disk, SSD)) wait.

The above-mentioned optional embodiments provided by the application are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the technical scope of the disclosure of the application shall be included in the scope of the application. within the scope of protection.

Claims (10)

1. A method of generating cohesive force units, the method comprising:

acquiring a first finite element model, wherein the first finite element model is a finite element model of a target structural member, the first finite element model comprises m target units, and m is an integer greater than or equal to 2;

generating a plurality of face units for each of the m target units;

determining n repeated surface unit pairs from a plurality of surface units of each target unit in the m target units, wherein each repeated surface unit pair in the n repeated surface unit pairs comprises two surface units with repeated positions, and n is an integer greater than or equal to 2;

generating n cohesive force units according to the n repeated surface unit pairs.

2. The method of claim 1, wherein the generating the plurality of face units for each of the m target units comprises:

obtaining a unit identifier of each target unit in the m target units;

And generating a plurality of surface units of the target unit by using a surface unit generation function according to the unit identifier of any one target unit in the m target units.

3. The method of claim 1, wherein the method further comprises:

generating a second finite element model, the second finite element model comprising a plurality of face units for each of the m target units;

the determining n repeated surface unit pairs from the plurality of surface units of each of the m target units includes:

displaying the second finite element model;

the n repeating surface unit pairs are found from all surface units in the displayed second finite element model using a repeating unit finding function.

4. A method according to any one of claims 1 to 3, wherein prior to generating n cohesive units from said n repeating pairs of surface units, further comprising:

creating a first set, wherein the first set comprises m first subsets which are in one-to-one correspondence with the m target units, and each first subset in the m first subsets comprises a unit identifier of a corresponding target unit and a unit identifier of each surface unit in a plurality of surface units of the corresponding target unit;

Creating a second set, wherein the second set comprises n second subsets which are in one-to-one correspondence with the n repeated surface unit pairs, and each second subset in the n second subsets comprises a unit identifier of each surface unit in two surface units included in the corresponding repeated surface unit pairs;

the generating n cohesive force units according to the n repeating surface unit pairs comprises:

generating the n cohesive force units according to the first set and the second set.

5. The method of claim 4, wherein said generating said n cohesive units from said first set and said second set comprises:

separating the face unit of each target unit from the face units of other target units according to the m first subsets in the first set so as to update node information of the separated face units;

acquiring n groups of node information corresponding to the n second subsets in the second set one by one, wherein each group of node information in the n groups of node information comprises node information of face units identified by each unit identifier in two unit identifiers included in the corresponding second subset;

generating the n cohesive force units according to the n groups of node information.

6. The method of claim 5, wherein the obtaining n sets of node information in one-to-one correspondence with the n second subsets in the second set comprises:

for any one second subset of the n second subsets, acquiring node information of the face unit identified by each unit identifier in two unit identifiers included in the second subset to obtain two node information;

determining the corresponding relation between node identifiers in the two node information;

and sequentially adding the node identifiers in the two node information into a group of node information corresponding to the second subset according to the corresponding relation between the node identifiers in the two node information.

7. The method of claim 6, wherein the two nodes identified by the corresponding two node identifications in the correspondence between the node identifications in the two node information are two nodes closest to each other among the nodes identified by all the node identifications in the two node information;

according to the correspondence between node identifiers in the two node information, sequentially adding the node identifiers in the two node information to a group of node information corresponding to the second subset, including:

Sequentially adding all node identifiers in one node information in the two node information to the group of node information;

ordering all node identifiers in the other node information in the two node information according to the sequence of all node identifiers in the one node information and the corresponding relation between the node identifiers in the two node information;

and sequentially adding all node identifiers in the sorted other node information into the group of node information.

8. The method of any one of claims 1 to 3, 5 to 7, wherein after generating n cohesive units from the n repeating pairs of face units, further comprising:

generating a third finite element model, the third finite element model comprising the n cohesive units;

bulk properties are set for the first finite element model and cohesive properties are set for the third finite element model.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, which computer program, when executed by the processor, implements the method according to any one of claims 1 to 8.

10. A computer readable storage medium having instructions stored therein which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 8.

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