CN116562056A - LS-DYNA-based method for realizing gradual electromagnetic forming sequence simulation - Google Patents
LS-DYNA-based method for realizing gradual electromagnetic forming sequence simulation Download PDFInfo
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Abstract
The invention belongs to the technical field of electromagnetic forming simulation, and particularly relates to a method for realizing gradual electromagnetic forming sequential simulation based on LS-DYNA, which adopts a standardized simulation model file structure to model and simulate an adjacent two-step electromagnetic flanging process, and can output stress, deformation and other information of a concerned component in a previous forming process in a self-defined manner by using a data output INTERFACE provided by LSDYNA software through an INTERFACE_SPRINGBACK_LSDYNA keyword for subsequent simulation modeling, thereby simplifying a data output flow, avoiding redundant information output, reducing data files and realizing effective transmission of simulation data.
Description
Technical Field
The invention belongs to the technical field of electromagnetic forming simulation, and particularly relates to a method for realizing gradual electromagnetic forming sequence simulation based on LS-DYNA.
Background
The aerospace industry in China rapidly develops, the requirements on light weight and high performance are put forward on metal components in the aerospace field, and large-scale complex components are increasingly used. Thus, conventional forming and manufacturing techniques are faced with serious challenges, and the creation and development of new forming techniques are also driven. The electromagnetic forming technology is an advanced manufacturing technology for quickly forming a metal workpiece by utilizing pulse electromagnetic force, can improve the forming performance of materials, reduce the rebound of components, improve the surface quality of parts, and has simple tooling and accurate and controllable technological process. Therefore, electromagnetic forming technology is increasingly used in the fields of aerospace, automobiles and the like.
In electromagnetic forming, energy conversion, stress and deformation evolution are complex, forming time is extremely short, and related parameters are difficult to accurately measure, so that an electromagnetic forming process needs to be researched by adopting a simulation analysis means. At present, simulation software commonly used for electromagnetic forming comprises COMSOL, ANSYS, LSDYNA and the like, electromagnetic force on a workpiece node is calculated through multi-physical field coupling solution, and then deformation of the workpiece is further calculated. The COMSOL generally analyzes the electromagnetic force first, then solves the deformation of the workpiece, and ignores the influence of the deformation on the electromagnetic force when calculating the deformation. The ANSYS can realize the sequential coupling of the electromagnetic field and the structural field by loading and considering the influence of the deformation of the workpiece in the set time step on the electromagnetic force of the next time step. The LSDYNA can realize the coupling of an electromagnetic field and a structural field in a smaller time step through a built-in coupling program, so that the simulation prediction precision is higher.
When electromagnetic forming is adopted to manufacture large-scale components, complex structures and high-precision parts, one-time discharge generally cannot meet the forming requirement, and multiple times of discharge are often needed to gradually realize the forming of the parts. In the existing simulation method, the stress and strain data of each node on the workpiece are output and applied to the workpiece in a node load mode in the next modeling, so that the simulation result of the two discharge processes is transferred. The method has the advantages of complex modeling flow, large workload, high specialized requirement, various data structure forms, large output stress and strain data files, long modeling process in the next step and easy occurrence of the problem of non-convergence of the model.
Therefore, by utilizing a proper data transmission interface, a standardized model file structure is designed, and a simulation modeling process is optimized, so that the method is an important way for improving the simulation prediction precision and efficiency of multi-step electromagnetic forming.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a method for realizing gradual electromagnetic forming sequence simulation based on LS-DYNA, which aims at realizing effective transmission of prediction results of two adjacent electromagnetic forming steps and standardized modeling of an electromagnetic forming process by utilizing a standardized simulation model file structure and an optimized modeling process, further realizing sequential simulation analysis and prediction of multi-step discharge processes of electromagnetic forming, simplifying the modeling process and improving the efficiency and precision of simulation.
The technical scheme adopted for achieving the purposes is as follows:
the method for realizing the progressive electromagnetic forming sequence simulation based on LS-DYNA is characterized in that a standardized simulation model file structure is adopted to model and simulate the adjacent two-step electromagnetic flanging process, including simulation modeling, preceding simulation and following simulation;
the simulation modeling comprises the following steps:
s1, carrying out geometric modeling and grid division on components involved in electromagnetic forming to form a geometric model of each component; the component comprises a workpiece, a die, a blank pressing block and a forming coil;
s2, based on deformation conditions of each component in the forming process and influence on the subsequent simulation analysis, carrying out data grouping on the geometric model of each component, wherein the geometric model at least comprises two kinds of component files to be reserved and necessary component files of the model;
s3, selecting and modeling a material model and a grid cell type to be endowed by the geometric model of each component;
s4, defining boundary conditions, loading conditions and solving settings in the simulation model;
s5, outputting and setting a result file and a member file to be reserved;
the preceding simulation: s1 to S5, completing simulation modeling, and obtaining a simulation result file and a dynain file containing the deformed member to be reserved through simulation calculation;
the following simulation: and S1 to S5 are implemented, in the step S2, the dynain file simulated in advance is used as a member file to be reserved, and after simulation modeling is completed, a simulation result file and a dynain file containing the deformed member to be reserved are obtained through simulation calculation.
Preferably, in the step S2 of simulation modeling, the data packets include three kinds of data packets, including a change component file in addition to a component file to be reserved and a necessary component file of the model; in the process of the previous simulation, the component file to be replaced is a change component file; in the post-simulation process, the new addition/replacement component file replaces the component file to be replaced as the change component file.
Preferably, in the step S2 of simulation modeling, the method for data grouping is as follows:
deformation occurs in the forming process, stress and deformation of the deformation are needed to be considered, a component taking the subsequent simulation as input is defined as a component to be reserved, and a corresponding geometric model data file is a component file to be reserved;
the forming process is not deformed, stress and deformation of the forming process are not needed to be considered, but the forming process also needs to be incorporated into a component taking the subsequent simulation as input, the component taking the simulation as model constraint and boundary is defined as a model necessary component, and a corresponding geometric model data file is a model necessary component file;
the forming process is not deformed, but a component with boundary conditions needing to be changed in the simulation modeling process of the post simulation, or a component which is not needed in the simulation modeling process of the post simulation is defined as a component to be replaced, and a geometric model data file corresponding to the component to be replaced is used as a file to be replaced; in the simulation modeling process of the post simulation, a component which is newly added or changed relative to the simulation modeling process of the prior shaping simulation is defined as a newly added/changed component, and a corresponding geometric model data file is used as a newly added/changed component file.
Preferably, in the step S4 of simulation modeling, the boundary conditions include constraint conditions of the members and contact conditions between the members.
Preferably, in the step S4 of simulation modeling, the loading condition includes an electromagnetic load of the corresponding member.
Preferably, in the step S4 of simulation modeling, the solving arrangement includes setting an end time and a time step of solving the structural field and the electromagnetic field.
Preferably, in the step S5 of simulation modeling, the result file output setting includes setting the content and structure of the output data, setting the frequency or interval time of the result file output, and defining the path and size of the result file output.
Preferably, in step S5 of the simulation modeling, the setting of the output of the member to be maintained includes using an intermediate_spring_lsdyna key, additionally defining an output file format of the member to be maintained, and outputting stress-strain information thereof, wherein an output time interval thereof is kept the same as an output time interval of the result file.
Preferably, the standardized simulation model file structure comprises a main k file and a plurality of geometric model k files, wherein the main k file brings the geometric model k files into the whole simulation model through INCLUDE keywords;
the main k file comprises material model information, grid cell type information, boundary condition information, loading condition information, solving setting information and result file output setting information, wherein the result file output setting information comprises an INTERFACE_SPRINGBACK_LSDYNA keyword;
the geometric model k file is used for recording the component file to be reserved, the necessary component file of the model and the change component file.
The invention has the beneficial effects that:
1) The invention can output the stress, deformation and other information of the concerned component in the former shaping process in a self-defined way through the data output INTERFACE provided by LSDYNA software by using the INTERFACE_SPRINGBACK_LSDYNA keyword, which is used for the post simulation modeling, and the related component and the output data content can be set according to the actual requirement, thereby simplifying the data output flow, avoiding the output of redundant information, reducing the data file and realizing the effective transmission of the simulation data.
2) According to the invention, the geometric models are grouped, the simulation model files of the standard structure are defined, and the model subjects and different geometric models are stored separately, so that in the modeling process of the post simulation, only the newly added/changed component files and the main k files are required to be changed, and other files can be directly called, thereby limiting the modification range required in the modeling process of the post simulation to the greatest extent, simplifying the modeling process of the post simulation, reducing the technical difficulty of the modeling process of the post simulation, and improving the modeling efficiency and the simulation precision.
Drawings
FIG. 1 is a flow chart of a simulation analysis of stepwise electromagnetic forming based on LS-DYNA modeling;
FIG. 2 is a schematic diagram of the file structure of the electromagnetic forming step-by-step simulation model of the invention;
FIG. 3 is a graph showing current curves used for sequential simulation modeling in example 5 of the present invention;
fig. 4 is a schematic diagram of the file structure of electromagnetic forming and electromagnetic shape correction simulation model in embodiment 5 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments.
Accordingly, the following detailed description of the invention, as provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment discloses a method for realizing progressive electromagnetic forming sequence simulation based on LS-DYNA, which is a preferred implementation scheme of the technical scheme, as shown in figure 1, a standardized simulation model file structure is adopted to model and simulate two adjacent electromagnetic flanging processes, including simulation modeling, preceding simulation and following simulation.
The simulation modeling comprises the following steps:
s1, performing geometric modeling and grid division on components related to electromagnetic forming by using software to form a geometric model of each component.
S2, based on deformation conditions of each component in the forming process and influence on the subsequent simulation analysis, data grouping is carried out on the geometric model of each component, and the geometric model is divided into a component file to be reserved and a necessary component file of the model. Deformation occurs in the forming process, stress and deformation of the structural members need to be considered, the structural members which are taken into the later simulation as input are defined as structural members to be reserved, and the corresponding geometric model data files are structural member files to be reserved. The forming process is not deformed, stress and deformation are not needed to be considered, but a component which is taken into the post simulation as input is also needed to be taken into consideration, the component which is taken as model constraint and boundary is defined as a model necessary component, and a corresponding geometric model data file is a model necessary component file.
And S3, selecting and modeling a material model and a grid cell type to be endowed by the geometric model of each component.
And S4, defining boundary conditions, loading conditions and solving settings in the simulation model.
S5, outputting the result file and the member file to be reserved.
The previous simulation: and (3) completing simulation modeling through the steps S1 to S5, and obtaining a simulation result file (simulation analysis result) and a dynain file containing the deformed components to be reserved through simulation calculation.
Post simulation: and S1 to S5 are implemented, in the step S2, a dynain file (simulation analysis result) of the previous simulation is taken as a member file to be reserved, and after simulation modeling is completed, the simulation result file and the dynain file containing the deformed member to be reserved are obtained through simulation calculation. If the next simulation is still available, the dynain file is taken as the member file to be reserved in the simulation modeling step S2 when the next simulation is performed.
Example 2
The embodiment discloses a method for realizing progressive electromagnetic forming sequence simulation based on LS-DYNA, which is a preferred implementation scheme of the technical scheme, as shown in figure 1, a standardized simulation model file structure is adopted to model and simulate two adjacent electromagnetic flanging processes, including simulation modeling, preceding simulation and following simulation.
The simulation modeling comprises the following steps:
s1, performing geometric modeling and grid division on components related to electromagnetic forming by using software to form a geometric model of each component.
S2, based on deformation conditions of each component in the forming process and influence on the subsequent simulation analysis, data grouping is carried out on the geometric model of each component, and the geometric model is divided into a component file to be reserved, a necessary component file of the model and a change component file. In the previous simulation process, the component file to be replaced is a change component file; in the process of the post simulation, the new added/replaced component file replaces the component file to be replaced as a change component file and can be also regarded as the component file to be replaced of the next simulation. Wherein:
deformation occurs in the forming process, the stress and deformation of the member need to be considered, the member which is taken into the later simulation as input is defined as a member to be reserved, and the corresponding geometric model data file is a member file (Gs 1) to be reserved;
the forming process is not deformed, stress and deformation are not needed to be considered, but a component which is taken as input by the later simulation is also needed to be taken into consideration, the component which is taken as model constraint and boundary is defined as a model necessary component, and a corresponding geometric model data file is a model necessary component file (Gs 2);
the forming process is not deformed, but a component with boundary conditions needing to be changed in the simulation modeling process of the post simulation, or a component not needing to be needed in the simulation modeling process of the post simulation is defined as a component to be replaced, and a geometric model data file corresponding to the component to be replaced is used as a file to be replaced (Gs 3); in the simulation modeling process of the post simulation, a component which is newly added or changed relative to the simulation modeling process of the prior shaping simulation is defined as a newly added/changed component, and a corresponding geometric model data file is used as a newly added/changed component file (Gs 4).
And S3, selecting and modeling a material model and a grid cell type to be endowed by the geometric model of each component.
And S4, defining boundary conditions, loading conditions and solving settings in the simulation model.
S5, outputting the result file and the member file to be reserved.
The previous simulation: and (3) completing simulation modeling through the steps S1 to S5, and obtaining a simulation result file and a dynain file containing the deformed components to be reserved through simulation calculation.
Post simulation: and S1 to S5 are implemented, in the step S2, the dynain file simulated in advance is used as a member file to be reserved, and after simulation modeling is completed, a simulation result file and a dynain file containing the deformed member to be reserved are obtained through simulation calculation. If the next simulation is still available, the dynain file is taken as the member file to be reserved in the simulation modeling step S2 when the next simulation is performed.
Example 3
The embodiment discloses a method for realizing progressive electromagnetic forming sequence simulation based on LS-DYNA, which is a preferred implementation scheme of the technical scheme, and adopts a standardized simulation model file structure to model and simulate the adjacent two-step electromagnetic flanging process, including simulation modeling, preceding simulation and following simulation.
The simulation modeling comprises the following steps:
s1, performing geometric modeling and grid division on components related to electromagnetic forming to form a geometric model of each component.
S2, based on deformation conditions of each component in the forming process and influence on the subsequent simulation analysis, data grouping is carried out on the geometric model of each component, wherein the geometric model at least comprises two kinds of component files to be reserved and necessary component files of the model.
And S3, selecting and modeling a material model and a grid cell type to be endowed by the geometric model of each component.
And S4, defining boundary conditions, loading conditions and solving settings in the simulation model. Wherein:
boundary conditions include constraint conditions of the respective members and contact conditions between the members;
the loading conditions include electromagnetic loading of the respective components. Electromagnetic loading includes two loading modes: the first is to load the resistance, inductance and voltage of the discharge circuit to the corresponding member (coil), and the second is to load the current curve obtained by theoretical calculation or experimental measurement to the corresponding member (coil);
the solving settings include setting end time, time steps for solving the structural and electromagnetic fields, iterative algorithms, etc.
S5, outputting the result file and the member file to be reserved. The result file output settings include setting the content and structure of the output data, setting the frequency or interval time of the result file output, defining the path and size of the result file output. In order to output stress, deformation and other information of the to-be-reserved member, the file output setting of the to-be-reserved member comprises the steps of adopting an INTERFACE_SPRINGBACK_LSDYNA keyword, additionally defining an output file format of the to-be-reserved member, outputting stress and strain information of the to-be-reserved member, and keeping the output time interval of the to-be-reserved member to be the same as that of a result file.
The previous simulation: and (3) completing simulation modeling through the steps S1 to S5, and obtaining a simulation result file and a dynain file containing the deformed components to be reserved through simulation calculation.
Post simulation: and S1 to S5 are implemented, in the step S2, the dynain file simulated in advance is used as a member file to be reserved, and after simulation modeling is completed, a simulation result file and a dynain file containing the deformed member to be reserved are obtained through simulation calculation.
Example 4
The embodiment discloses a method for realizing progressive electromagnetic forming sequence simulation based on LS-DYNA, which is a preferred implementation scheme of the technical scheme, namely, on the basis of the embodiment 1, 2 or 3, a standardized simulation model file structure shown in the figure 2 comprises a main k file and a plurality of geometric model k files, wherein the main k file comprises the geometric model k files into the whole simulation model through INCLUDE keywords.
The main k file comprises material model information, grid cell type information, boundary condition information, loading condition information, solving setting information and result file output setting information, wherein the result file output setting information comprises an INTERFACE_SPRINGBACK_LSDYNA keyword; the geometric model k file is used for recording the component file to be reserved, the necessary component file of the model and the change component file.
Further, after the post simulation is implemented, the simulation model checking verification is performed, repeated keywords in each file of the simulation model are checked, redundant keywords are deleted, so that public settings are stored in a main k file as much as possible, and the geometrical model k file only contains the least necessary information of the related model as much as possible.
Example 5
The embodiment discloses a method for realizing gradual electromagnetic forming sequence simulation based on LS-DYNA, which is a preferred implementation scheme of the technical scheme, adopts a standard simulation model file structure to model and simulate a two-step electromagnetic flanging process, reproduces the deformation behaviors of workpieces in the electromagnetic forming process and the electromagnetic shaping process, accurately predicts the die attaching precision of the workpieces, effectively optimizes the process parameters and provides good guidance for process design. The two-step electromagnetic flanging process is adopted to form a flanging structure, the first step (the previous simulation) adopts a flat spiral coil to carry out flanging forming, and at the moment, the fitting degree of a workpiece and a die is poor, and the die-attaching gap is large; and secondly (after simulation) performing shape correction by adopting a solenoid coil, so that the workpiece is further attached to the die, and the accurate forming of the part is realized.
The components in the simulation model comprise a workpiece to be formed, a die, a blank holder block and a forming coil. For the forming process, the forming coil is a flat spiral coil; and (3) for the correction process, the forming coil is a solenoid coil. In the simulation model, a workpiece is set as a deformed body, and a die, a blank holder and a forming coil are all set as rigid bodies. The workpiece is a member to be reserved, the die and the blank holder block are necessary members for the model, the forming coil is a member to be replaced, and the shaping coil is a new member/modified member.
The modeling process of the electromagnetic forming in the first step is as follows:
s1, modeling a die, a workpiece to be formed, a blank pressing block and a flat spiral coil by utilizing UG software according to an experimental assembly position; and respectively exporting x_t geometric model files, completing grid division in ANSYS software, and respectively storing the x_t geometric model files as geometric model files.
S2, merging the geometric model files of the die and the edge pressing block, deleting redundant keywords, only reserving geometric information, and naming the geometric information as die. K; deleting redundant keywords in the geometric model file of the flat spiral coil, and naming the redundant keywords as coil.k; and deleting redundant keywords in the geometric model file of the workpiece to be formed, and naming the keywords as workpiece.
And S3, selecting and modeling a material model and a grid cell type to be endowed by the geometric model of each component. Specific: all geometric models adopt hexahedral solid units; the die and the edge pressing block are set as rigid bodies, and a material model of No. 45 steel is given; selecting 2219 aluminum alloy material attribute for a workpiece to be formed, adopting a C-S constitutive model, and giving model parameters; setting electromagnetic parameters of a workpiece to be formed, and giving the conductivity and the magnetic permeability of the workpiece to be formed; the coil is set as a rigid body, the material property of red copper is selected, and the conductivity and the magnetic conductivity of the coil are given.
S4, restraining the displacement of all degrees of freedom of the die, the blank holder and the flat spiral coil; and selecting the outermost nodes of the workpiece to form a node set, and restricting all degrees of freedom of the node set. And setting contact between the workpiece to be formed and the die and between the workpiece and the blank holder, and selecting a simple surface-to-surface contact model, wherein the friction coefficient is set to be 0.15.
S5, defining a current curve, wherein the current curve in the electromagnetic forming process is shown as a solid line in FIG. 3. The cross section of the current flowing in and out of the flat spiral coil is defined, and the current direction is defined, and a current curve is loaded into the flat spiral coil.
S6, setting the solving time of the simulation model to 500 microseconds; the structural field solution time step is set to 2 microseconds; the electromagnetic field solving time step is set to 0.5 microseconds; others take a default form.
S7, defining a simulation result output every 2 microseconds, and keeping a default mode. Outputting deformation information of the workpiece to be formed by adopting an INTERFACE_SPRINGBACK_LSDYNA keyword; setting corresponding parameters, and simultaneously outputting stress information and deformation information of the workpiece. After the simulation model file is checked, the solution is submitted to complete the simulation analysis (i.e., the previous simulation) of the first step.
In the first simulation, the main file is named em_1.k, and the work piece. K, die. K and coil. K are included by using INCLUDE key. After solving, an em_1.Dynain file is generated, which contains the geometric model of the deformed workpiece, and stress, strain and deformation information, as shown in fig. 4.
The modeling process of the second electromagnetic correction is as follows:
s1, modeling a solenoid coil by utilizing UG software, deriving an x_t geometric model file, and completing grid division in ANSYS software, wherein the geometric model file is stored as a geometric model file coil_2.K.
S2, deleting redundant keywords in the geometric model file coil_2.K of the correction coil.
S3, the shape correction coil is also a hexahedral solid unit, is set to be a rigid body, adopts the material property of red copper, and gives the conductivity and the magnetic conductivity.
S4, restraining the displacement of all degrees of freedom of the shape correction coil.
S5, defining a current curve, wherein the current curve in the electromagnetic shaping process is shown as a dotted line in FIG. 3. Defining the cross-section of the solenoid coil in and out of which current flows, and the direction of the current, a current profile is loaded into the solenoid coil.
S6, the model solving setting and the first modeling are consistent.
And S7, the output setting of the result file is consistent with the modeling in the first step.
In the second simulation step, the main file is named em_2.K, and the INCLUDE key is used to contain em_1.Dynain, die.k and coil_2.K. After solving, an em_2.Dynain file is generated, which contains the geometric model of the deformed workpiece, and stress, strain and deformation information, and can also be used for modeling of the next simulation, as shown in fig. 4.
Claims (10)
1. The method for realizing the progressive electromagnetic forming sequence simulation based on LS-DYNA is characterized in that a standardized simulation model file structure is adopted to model and simulate the adjacent two-step electromagnetic flanging process, including simulation modeling, preceding simulation and following simulation;
the simulation modeling comprises the following steps:
s1, carrying out geometric modeling and grid division on components involved in electromagnetic forming to form a geometric model of each component; the component comprises a workpiece, a die, a blank pressing block and a forming coil;
s2, based on deformation conditions of each component in the forming process and influence on the subsequent simulation analysis, carrying out data grouping on the geometric model of each component, wherein the geometric model at least comprises two kinds of component files to be reserved and necessary component files of the model;
s3, selecting and modeling a material model and a grid cell type to be endowed by the geometric model of each component;
s4, defining boundary conditions, loading conditions and solving settings in the simulation model;
s5, outputting and setting a result file and a member file to be reserved;
the preceding simulation: s1 to S5, completing simulation modeling, and obtaining a simulation result file and a dynain file containing the deformed member to be reserved through simulation calculation;
the following simulation: and S1 to S5 are implemented, in the step S2, the dynain file simulated in advance is used as a member file to be reserved, and after simulation modeling is completed, a simulation result file and a dynain file containing the deformed member to be reserved are obtained through simulation calculation.
2. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: in the step S2 of simulation modeling, three data groups are provided, and the data groups comprise a change component file besides a component file to be reserved and a necessary component file of a model; in the process of the previous simulation, the component file to be replaced is a change component file; in the post-simulation process, the new addition/replacement component file replaces the component file to be replaced as the change component file.
3. The method for realizing the stepwise electromagnetic forming sequence simulation based on the LS-DYNA as claimed in claim 2, wherein the method comprises the following steps: in the step S2 of simulation modeling, the method for data grouping is as follows:
deformation occurs in the forming process, stress and deformation of the deformation are needed to be considered, a component taking the subsequent simulation as input is defined as a component to be reserved, and a corresponding geometric model data file is a component file to be reserved;
the forming process is not deformed, stress and deformation of the forming process are not needed to be considered, but the forming process also needs to be incorporated into a component taking the subsequent simulation as input, the component taking the simulation as model constraint and boundary is defined as a model necessary component, and a corresponding geometric model data file is a model necessary component file;
the forming process is not deformed, but a component with boundary conditions needing to be changed in the simulation modeling process of the post simulation, or a component which is not needed in the simulation modeling process of the post simulation is defined as a component to be replaced, and a geometric model data file corresponding to the component to be replaced is used as a file to be replaced; in the simulation modeling process of the post simulation, a component which is newly added or changed relative to the simulation modeling process of the prior shaping simulation is defined as a newly added/changed component, and a corresponding geometric model data file is used as a newly added/changed component file.
4. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: in the step S1 of simulation modeling, the components involved in electromagnetic forming comprise a workpiece, a die, a blank holder and a forming coil.
5. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: in step S4 of the simulation modeling, the boundary conditions include constraint conditions of the members and contact conditions between the members.
6. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: in step S4 of the simulation modeling, the loading condition includes an electromagnetic load of the corresponding member.
7. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: in the step S4 of simulation modeling, the solving setting includes setting an end time and a time step of solving the structural field and the electromagnetic field.
8. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: in the step S5 of simulation modeling, the result file output setting includes setting the content and structure of the output data, setting the frequency or interval time of the result file output, and defining the path and size of the result file output.
9. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: in the step S5 of simulation modeling, the setting of the output of the member to be maintained includes using an intermediate_spring_lsdyna keyword, additionally defining an output file format of the member to be maintained, and outputting stress-strain information thereof, wherein an output time interval of the output file format is kept the same as an output time interval of a result file.
10. The method for implementing stepwise electromagnetic forming sequence simulation based on LS-DYNA as in claim 1, wherein the steps of: the standardized simulation model file structure comprises a main k file and a plurality of geometric model k files, wherein the main k file brings the geometric model k files into the whole simulation model through INCLUDE keywords;
the main k file comprises material model information, grid cell type information, boundary condition information, loading condition information, solving setting information and result file output setting information, wherein the result file output setting information comprises an INTERFACE_SPRINGBACK_LSDYNA keyword;
the geometric model k file is used for recording the component file to be reserved, the necessary component file of the model and the change component file.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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