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EP3311099B1 - Atténuation et accord en fréquence d'explosion/d'impact - Google Patents

Atténuation et accord en fréquence d'explosion/d'impact Download PDF

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Publication number
EP3311099B1
EP3311099B1 EP16812347.9A EP16812347A EP3311099B1 EP 3311099 B1 EP3311099 B1 EP 3311099B1 EP 16812347 A EP16812347 A EP 16812347A EP 3311099 B1 EP3311099 B1 EP 3311099B1
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EP
European Patent Office
Prior art keywords
tuning
layer
layer assembly
dissipative
mitigation system
Prior art date
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EP16812347.9A
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German (de)
English (en)
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EP3311099A1 (fr
EP3311099A4 (fr
Inventor
Michael Thouless
Ellen M. Arruda
Tanaz RAHIMZADEH
Levon CIMONIAN
Marie RICE
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University of Michigan System
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University of Michigan System
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Priority to EP18200528.0A priority Critical patent/EP3517883B1/fr
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Publication of EP3311099A4 publication Critical patent/EP3311099A4/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
    • F42D5/045—Detonation-wave absorbing or damping means
    • F42D5/05—Blasting mats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H1/00—Personal protection gear
    • F41H1/04—Protection helmets
    • F41H1/08—Protection helmets of plastics; Plastic head-shields
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H1/00—Personal protection gear
    • F41H1/02—Armoured or projectile- or missile-resistant garments; Composite protection fabrics

Definitions

  • the present disclosure relates to a novel concept for the design of structures to protect against blast and impact.
  • US 2013/0000476 A1 discloses a device including a first material configured to reflect a substantial portion of a specified incident air blast wave energy.
  • the first material includes a first reflective region having a first acoustic impedance substantially mismatched to air's acoustic impedance.
  • the first material includes a second reflectiveregion having a second acoustic impedance substantially less than the first acoustic impedance.
  • the device includes a second material configured to attenuate the specified incident air blast wave energy utilizing an inelastic response.
  • the second material is configured for wearing proximate to a human body.
  • US 2014/0026279 A1 discloses a spiral shaped element and embedded wavy materials for use in a shock mitigating material to dissipate the energy associated with the impact of an object.
  • the shock mitigating material can be used in helmets, bumpers, bullet proof vests, military armor, and other applications.
  • EP 0 930 832 B1 discloses another shock mitigating material.
  • a design strategy for a composite material and an exemplary embodiment of that design, is presented that optimally and repeatedly dissipates energy transmitted through a composite as a result of an impact event.
  • the design strategy uses one or more elastic layers to modulate the frequency content of the stress wave traveling through the composite, and a viscoelastic layer to dissipate energy at that frequency.
  • Our current experimental and computational results demonstrate that this design efficiently mitigates the pressure and dissipates the energy transmitted through the composite.
  • a composite structure consisting of lightweight elastic and viscoelastic components chosen and configured to optimally reduce the impulse, while simultaneously mitigating the force (pressure) transmitted through the composite material from an impact load, is provided and is generally referred to as the MITIGATIUM TM design.
  • the innovation of the approach that led to the development of this MITIGATIUM TM design rubric is that it recognizes that a highly dissipative material alone is generally not going to be useful in impact loadings. Rather, optimal, repeated dissipation can be obtained only by means of a layered composite in which the dissipative component is matched to the other components based on specific relationships among their respective mechanical properties.
  • the properties of the elastic and viscoelastic components, and their placement within the layered system are optimally chosen to achieve three outcomes: 1) attenuate the pressure transmitted through the composite; 2) modulate the frequency content of the stress waves within the composite layers so that 3) the energy imparted by the impulse is efficiently dissipated as it is transmitted through the composite.
  • the synergistic nature of MITIGATIUM TM arises because it couples the dissipative component to other component(s) specifically chosen to tune the stress wave traveling through the elastic materials to a frequency at which it can most efficiently be dissipated by the viscous response of the dissipative layer.
  • Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
  • spatially relative terms such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures.
  • Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features.
  • the example term “below” can encompass both an orientation of above and below.
  • the device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
  • the present invention will find utility in a wide range of applications, including, but not limited to, vehicle armor, personal armor, blast protection, impact protection, vests, helmets, body guards (including chest protection, shin protection, hip protection, rib protection, elbow protection, knee protection, running shoes), firing range protection, building protection, packaging of appliances and devices, and the like. It should be appreciated that the present teachings are applicable to any blast and/or impact situation.
  • a multi-layer tuning and mitigation system 10 for blast and/or impact mitigation.
  • the multi-layer tuning and mitigation system 10 comprises a tuning layer assembly 12 and a dissipative layer assembly 14.
  • the tuning layer assembly 12 can comprise one or more individual elastic layers having an acoustic impedance.
  • dissipative layer assembly 14 can comprise one or more individual viscoelastic layers.
  • a stress wave is produced whose frequencies entering the dissipative layer assembly 14 are determined by the mechanical and physical properties (e.g. acoustic impedance) of the tuning layer assembly 12 and the geometry and nature of the impact event itself.
  • the dissipative layer assembly 14 is chosen to be complementary to the tuning layer assembly 12 to tune the frequencies of the stress waves into a range that is damped by the dissipative layer assembly 14.
  • the damping frequencies required for the dissipative layer assembly 14 are application specific; that is, they depend upon the impact event itself as well as on the shape and size of the impact mitigating structure itself.
  • multi-layer tuning and mitigation system 10 can comprise a single-layer tuning layer assembly 12 and a single-layer dissipative layer assembly 14.
  • single-layer tuning layer assembly 12 is an elastic material that is sufficient to work with single-layer dissipative layer assembly 14 to tune the frequencies of the stress waves of the impact.
  • Single-layer dissipative layer assembly 14 is a viscoelastic material selected to mitigate the resulting tuned frequencies of the stress wave to dissipate the kinetic energy. As illustrated in FIG.
  • the viscoelastic material is selected based on the particular tuned frequencies, wherein, for example, viscoelastic material V1 is sufficient to dissipate approximately 77% of the kinetic energy (KE) of the tuned frequencies, V2 is sufficient to dissipate approximately 95% of the kinetic energy (KE) of the tuned frequencies, and V3 is sufficient to dissipate approximately 96% of the kinetic energy (KE) of the tuned frequencies.
  • FIG. 2 was generated in response to an indenter impacting the structure of FIG. 1 with a kinetic energy of approximately 10 J.
  • the tuning layer assembly 12 is a thin elastic material and dissipative layer assembly 14 is a thicker viscoelastic material.
  • the dominant frequencies that enter the second layer in this example are in the range of 0.01 - 100 Hz (approximately).
  • multi-layer tuning and mitigation system 10 can comprise a single-layer tuning layer assembly 12 and a multi-layer dissipative layer assembly 14.
  • single-layer tuning layer assembly 12 is an elastic material that is sufficient to work with multi-layer dissipative layer assembly 14 to tune the frequencies of the stress waves of the impact.
  • Multi-layer dissipative layer assembly 14 can comprise two or more viscoelastic materials selected to each mitigate a portion of the resulting tuned frequencies of the stress wave to dissipate the kinetic energy.
  • several layers of multi-layer dissipative layer assembly 14 can be used to dissipate the same frequencies, different frequencies, and/or overlapping frequencies.
  • the single-layer tuning layer assembly 12 can work to tune the stress waves to a range of frequencies, and one layer of dissipative layer assembly 14 can dissipate a first subrange of the frequencies and a second layer of dissipative layer assembly 14 can dissipate a second subrange of the frequencies.
  • the first and second subranges can be different, overlapping, or the same. As illustrated in FIG.
  • the viscoelastic materials of multi-layer dissipative layer assembly 14 are selected based on the particular tuned frequencies, wherein, for example, viscoelastic material composite V1 is sufficient to dissipate approximately 80% of the kinetic energy (KE) of the tuned frequencies, viscoelastic material composite V2 is sufficient to dissipate approximately 94% of the kinetic energy (KE) of the tuned frequencies, and viscoelastic material composite V3 is sufficient to dissipate approximately 95% of the kinetic energy (KE) of the tuned frequencies.
  • KE kinetic energy
  • multi-layer tuning and mitigation system 10 can comprise a multi-layer tuning layer assembly 12 and a single-layer dissipative layer assembly 14, or a multi-layer tuning layer assembly 12 and a multi-layer dissipative layer assembly 14.
  • tuning layer assembly 12 can be modified, thereby varying its performance and acoustic impedance, by selecting the material, thickness, and, in the case of a multi-layer configuration, how and if the layers are bonded.
  • dissipative layer assembly 14 can be modified, thereby varying its dissipative performance, by selecting the material, thickness, and, in the case of a multi-layer configuration, how and if the layers are bonded.
  • tuning layer assembly 12 can be made of an elastic material, such as thermoplastics (e.g., polycarbonate, polyethylene), metals, ceramics, polymers (elastic type), composites, and biological solids (e.g. bone, ligament).
  • dissipative layer assembly 14 can be made of viscoelastic material, such as polymers. It should be understood, however, that polymers may be elastic and/or viscoelastic. Whether they are elastic or viscoelastic in a given application depends upon the application temperature and the frequencies under consideration. In other words, a given polymer at a given temperature responds elastically to some frequencies and viscoelastically to other frequencies.
  • the tuning layer assembly 12 is typically chosen based on other functional requirements of the application, such as chip resistance of a layered paint, ballistic penetration resistance in a military armor, and protecting the skull against facture in a sport helmet.
  • the acoustic impedance of the tuning layer assembly 12 is therefore set once this choice is made (however there may be several materials that fit the bill).
  • the thickness of the tuning layer assembly 12 may also be set by these existing functional requirements.
  • the mechanical and physical attributes of the tuning layer assembly 12 determine one of the frequencies that will be passed to the dissipative layer assembly 14 in a tuned design.
  • the dissipative layer assembly 14 is chosen to have a lower acoustic impedance than the tuning layer assembly 12, to provide the tuning and to mitigate the force transmitted.
  • the elastic properties of the dissipative layer assembly 14 determine this impedance; optimal tuning requires a significant impedance reduction in layer 2 from that of layer 1.
  • the dissipative layer assembly 14 may include portions that are elastic, in which it acts as the spring in a mass-spring dynamic system that has a characteristic frequency, or it may include portions that are viscoelastic to additionally damp either the tuned frequency or the mass-spring frequency, or both. If the dissipative layer assembly 14 is elastic in part, additional viscoelastic layers are required to dissipate the impulse. A viscoelastic dissipative layer assembly 14 is both elastic and viscous, so that it satisfies all of the previously described functions of the dissipative layer assembly 14 to tune with the tuning layer assembly 12 and vibrate with the tuning layer assembly 12 as a mass-spring system. In addition it is chosen to damp one or more of the frequencies. If the dissipative layer assembly 14 is elastic, an additional layer is chosen to damp the transmitted frequencies.
  • a sport's (football) helmet is chosen as a design example.
  • Current helmet designs have other functions, such as preventing skull fracture; therefore we chose materials for the present demonstration that are similar to those currently used.
  • the outer shell of a football helmet is often a thermoplastic, such as polycarbonate (PC), therefore we limited our choice of outer shell layer to similar polymers. These materials do not plastically deform under the impact loadings seen in sports. Therefore, they respond as linear elastic solids. Mitigating the force transmitted through elastic materials is easily accomplished by an impedance mismatch approach.
  • Current helmets utilize this strategy effectively by coupling the first, high elastic impedance layer to a second, low-elastic-impedance layer.
  • dissipative third material layer we limited the selection of the dissipative third material layer to viscoelastic materials because the design must be capable of dissipating the same amount of energy every time the helmet is impacted. Plastically deforming materials and materials that fracture, delaminate, craze, and/or crack upon an initial impact will not be effective in dissipating energy upon subsequent impacts of equal intensity.
  • a linear viscoelastic material can dissipate energy repeatedly. However, it is most effective at dissipating energy at one specific frequency: this critical frequency ( f CRlT ) is a function of its unrelaxed and relaxed moduli and its characteristic relaxation time. In an impact, the stress wave transmitted to a solid material contains a broad spectrum of energy, therefore, this same viscoelastic material acting alone will not be effective in dissipating impact energy.
  • MITIGATIUM TM Data supporting energy dissipation - Impact experiments have been conducted on MITIGATIUM TM and on an existing helmet design and determined that MITIGATIUM TM results in a significantly lower peak acceleration than the existing helmet does. We have compared these experimental results to computational analyses to validate our computational models of impact loading and stress wave propagation. We also conducted one- and two-dimensional computational analyses of a MITIGATIUM TM helmet design and an existing helmet design on a skull/brain system to demonstrate the energy dissipating capabilities of MITIGATIUM TM . Our results demonstrate that the MITIGATIUM TM helmet reduces the pressure and impulse transmitted to the skull and hence, the brain, and MITIGATIUM TM also reduces translational and rotational accelerations within the brain compared to those of an existing helmet design.
  • MITIGATIUM TM prototype specimen was built as follows: layer 1, 2.4 mm thick PE (McMaster Carr); layer 2, 12.7 mm thick vinyl nitrile (Grainger); layer 3, 14.3 mm thick polyurethane (PU, McMaster Carr, actually three 4.1 mm layers of PU stacked together); layer 4, 12.7 mm thick soft "comfort” foam (McMaster Carr).
  • the overall dimensions of the MITIGATIUM TM specimen were 305 mm ⁇ 305 mm ⁇ 42 mm ["MITIGATIUM TM unbounded"].
  • a test specimen based on an existing helmet design was also built.
  • the derivative of the position vs. time data was computed using a 5-point centered finite differencing method to obtain velocity vs. time data.
  • the derivative of the velocity vs. time data was similarly computed to obtain acceleration vs. time data.
  • the peak acceleration of the indenter was determined for each sample type and the results appear in Table 1.
  • the peak accelerations of the indenter during impact of the bonded specimens exceeded those of the unbonded specimens for both MITIGATIUM TM and Current samples.
  • the peak accelerations of the indenter during impact of the two "Current" samples exceeded those of the MITIGATIUM TM samples for both bonded and unbonded cases. Therefore, the lowest peak indenter acceleration was that impacting the unbonded MITIGATIUM TM sample.
  • the acceleration of the head in an impact is directly proportional to the peak force transmitted through a helmet to the skull.
  • the impact experiments performed here are not a direct indication of the force transmitted through the samples, but the acceleration of the indenter serves as a proxy for the skull and provides an indication of the force mitigating response of the samples. Therefore, these results indicate the MITIGATIUM TM sample is a better attenuator of force than the current helmet design is, and unbounded layers attenuate force better than bonded layers.
  • the indenter was given an initial velocity of 3.7 m/s corresponding to the velocity of a 2.8 kg indenter dropped from a height of 72 cm, in accordance with the experiments.
  • a body force of 79,000 kg/m 2 s 2 (density * gravity) was also applied to the indenter to account for the gravitational force.
  • the maximum indenter accelerations determined from these analyses are: MIGATIUM TM bonded, 550 m/s 2 ; Current bonded, 700 m/s 2 .
  • the computational results are within 10% of the mean experimental values for the peak accelerations given in Table 1. These results replicate what was determined experimentally, namely, MITIGATIUM TM is a better force attenuator than the Current helmet design.
  • the new MITIGATIUM TM design paradigm cannot only further reduce the over-pressure by an additional order of magnitude over existing approaches, it can also reduce the impulse delivered to the brain by an order of magnitude.
  • a single- or multi-layer design allows for tuning of an arbitrary impact into a specific frequency that can be optimally dissipated by the viscoelastic layer.
  • the viscoelastic layer acting alone, is not effective.
  • Our one-dimensional analysis shows that the use of a viscoelastic material alone, without tuning components, transmits 90% of the impulse of an impact event. However, when a viscoelastic material is optimally coupled to elastic materials that tune the stress wave to the critical damping frequency of the viscoelastic material, less than 30% of the impulse is transmitted.
  • this optimal MITIGATIUM TM design can comprise a tuned frequency that is high, so the thickness of the third dissipative layer is reduced because of the higher tuning frequency. Therefore, this optimal MITIGATIUM TM would be thinner and lighter weight than current football helmets.
  • the required properties of the viscoelastic material are well within any expected range of polyurethanes.
  • FIGS. 6A and 6B Two-dimensional analysis of impact response of helmets - A MITIGATIUM TM helmet design was compared to an existing sport helmet using two-dimensional finite element analyses of impact loading.
  • the commercial finite-element package ABAQUS Explicit was again used for the simulations.
  • the geometries used in the finite-element models are shown in FIGS. 6A and 6B .
  • the head was modeled as a two-component system consisting of an outer rim with a material having properties that approximated a skull, and an inner region of material having properties approximating the brain.
  • the model corresponding to an existing football helmet design has a 4 mm outer layer of ABS plastic, a 23 mm second layer of a hard foam, and a 9 mm inner layer of "comfort” foam, as shown in FIG. 6A .
  • the MITIGATIUM TM helmet in FIG. 6B was chosen to have the same mass and volume as the existing helmet.
  • the 4 mm outer shell layer is polyethylene
  • the 20.5 mm second layer is a styrene-based elastic foam
  • the 2.5 mm third layer is a viscoelastic urethane-based material.
  • the fourth layer on this helmet is not necessary; it is included to match the size and weight of the existing helmet, and because the comfort foam is important to helmet wearers.
  • the MITIGATIUM TM helmet design can be made significantly thinner and lighter than the existing helmet. Choosing equal mass designs normalizes the response, as the effectiveness of armor in reducing momentum transfer depends on mass.
  • the helmet models were subjected to an oblique impact pressure load of shape and duration shown in FIG. 6C . Peak pressure and impulse transmitted to the skull were determined. Linear and rotational accelerations were examined throughout the region of the brain and peak values recorded for comparison. The results are shown in Table 3 and in FIGS. 7A-7C . As the table shows, the choice of outer layer affects the pressure, impulse, and duration of the impact imparted to the helmet from a given impact load.
  • the last two columns compare the pressure and impulse transmitted to the skull by the two helmet designs, these are normalized by the values transmitted by the existing helmet design.
  • the MITIGATIUM TM helmet transmits less than 1% of the pressure and 31% of the impulse that the existing helmet transmits. It is important to appreciate that it is only in this type of geometry-where there is interaction between the head and the helmet-that the full effects of impulse transmission be considered. Ultimately, the validation needs to be conducted with this type of geometry, rather than considering impulses transmitted to a massive rigid plate.
  • FIGS. 7A-7C show the peak pressure, translational acceleration, and rotational acceleration histories inside the brain in both helmet designs.
  • the peak values occur at different nodes for the various quantities recorded, and for different nodes in each helmet, but in every case, the highest magnitude was searched within the entire brain region and that is what is recorded for comparison.
  • the significant reductions in the peak pressure and accelerations for the MITIGATIUM TM helmet are clearly seen in the figure. It is also evident from FIGS. 7A-7C that in the existing undamped helmet, a single-impact loading-event results in multiple peak-acceleration events.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Vibration Dampers (AREA)
  • Laminated Bodies (AREA)

Claims (11)

  1. Système d'atténuation et d'accord pour atténuer une explosion ou un impact, ledit système d'atténuation et d'accord comprenant :
    un ensemble de couches d'accord (12) comprenant une couche élastique et ayant une première impédance acoustique ; et
    un ensemble de couches de dissipation (14) comprenant une couche de dissipation faite d'un matériau viscoélastique ayant une fréquence d'amortissement critique et ayant une seconde impédance acoustique inférieure à la première impédance acoustique, ladite couche de dissipation (14) étant proche de ladite couche élastique,
    la couche élastique et la couche de dissipation étant configurées collectivement pour accorder les ondes de contrainte résultant de l'explosion ou de l'impact à une ou plusieurs fréquences d'accord spécifiques qui correspondent à la fréquence d'amortissement critique de la couche de dissipation, la couche de dissipation s'accordant avec la couche élastique et vibrant avec la couche élastique comme un système masseressort.
  2. Système d'atténuation et d'accord selon la revendication 1, l'ensemble de couches d'accord (12) comprenant deux ou plus de deux couches individuelles.
  3. Système d'atténuation et d'accord selon la revendication 1, l'ensemble de couches de dissipation (14) comprenant deux ou plus de deux couches individuelles.
  4. Système d'atténuation et d'accord selon la revendication 3, une première des deux ou plus de deux couches individuelles de l'ensemble de couches de dissipation (14) étant configurée pour dissiper une première desdites fréquences d'accord spécifiques et une deuxième des deux ou plus de deux couches individuelles de l'ensemble de couches de dissipation (14) étant configurée pour dissiper une deuxième desdites fréquences d'accord spécifiques, ladite deuxième fréquence d'accord spécifique étant différente de ladite première fréquence d'accord spécifique.
  5. Système d'atténuation et d'accord selon la revendication 3, une première des deux ou plus de deux couches individuelles de l'ensemble de couches de dissipation (14) étant configurée pour dissiper une première desdites fréquences d'accord spécifiques et une deuxième des deux ou plus de deux couches individuelles de l'ensemble de couches de dissipation (14) étant configurée pour dissiper une deuxième desdites fréquences d'accord spécifiques, ladite deuxième fréquence d'accord spécifique étant la même que ladite première fréquence d'accord spécifique.
  6. Système d'atténuation et d'accord selon la revendication 1, les propriétés dudit ensemble de couches d'accord (12) étant configurées pour accorder les ondes de contrainte résultant de l'explosion ou de l'impact à ladite fréquence d'accord spécifique en utilisant des paramètres de matériau.
  7. Système d'atténuation et d'accord selon la revendication 6, lesdites propriétés étant configurées à partir du groupe constitué de l'épaisseur, du type de matériau et du type de liaison.
  8. Système d'atténuation et d'accord selon la revendication 1, ledit ensemble de couches d'accord (12) étant configuré pour permettre le passage de ladite fréquence d'accord spécifique vers ladite couche de dissipation (14), moyennant quoi ladite fréquence d'accord spécifique est dissipée dans ledit ensemble de couches de dissipation (14).
  9. Système d'atténuation et d'accord selon la revendication 1, ledit ensemble de couches d'accord (12) étant configuré pour permettre le passage de ladite fréquence d'accord spécifique vers ledit ensemble de couches de dissipation (14), moyennant quoi ladite fréquence d'accord spécifique est dissipée de manière viscoélastique dans ledit ensemble de couches de dissipation.
  10. Système d'atténuation et d'accord selon la revendication 1, une épaisseur dudit ensemble de couches de dissipation (14) étant suffisante pour que la présence d'une onde de contrainte de ladite fréquence d'accord spécifique décroisse sensiblement avant le passage de ladite onde de contrainte à travers ledit ensemble de couches de dissipation (14).
  11. Système d'atténuation et d'accord selon la revendication 1, ledit ensemble de couches d'accord (12) étant joint audit ensemble de couches de dissipation (14).
EP16812347.9A 2015-06-17 2016-06-15 Atténuation et accord en fréquence d'explosion/d'impact Active EP3311099B1 (fr)

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US201562180931P 2015-06-17 2015-06-17
US201615036293A 2016-05-12 2016-05-12
PCT/US2016/037645 WO2016205380A1 (fr) 2015-06-17 2016-06-15 Atténuation et accord en fréquence d'explosion/d'impact

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EP3311099A1 EP3311099A1 (fr) 2018-04-25
EP3311099A4 EP3311099A4 (fr) 2019-05-22
EP3311099B1 true EP3311099B1 (fr) 2021-12-29

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EP (2) EP3311099B1 (fr)
JP (2) JP6595628B2 (fr)
CA (1) CA2989822C (fr)
ES (2) ES2912334T3 (fr)
WO (1) WO2016205380A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
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WO2015119695A2 (fr) * 2013-11-14 2015-08-13 The Regents Of The University Of Michigan Atténuation et accord de fréquence d'explosion/d'impact

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CA2989822A1 (fr) 2016-12-22
JP6754820B2 (ja) 2020-09-16
ES2912334T3 (es) 2022-05-25
EP3311099A1 (fr) 2018-04-25
JP2018521289A (ja) 2018-08-02
EP3517883A1 (fr) 2019-07-31
CA2989822C (fr) 2023-02-14
EP3517883B1 (fr) 2022-04-20
JP6595628B2 (ja) 2019-10-23
EP3311099A4 (fr) 2019-05-22
JP2019078409A (ja) 2019-05-23
ES2904548T3 (es) 2022-04-05

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