CN113343371A - Design method of foam-filled negative Poisson's ratio composite structure - Google Patents

Design method of foam-filled negative Poisson's ratio composite structure Download PDF

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CN113343371A
CN113343371A CN202110127769.XA CN202110127769A CN113343371A CN 113343371 A CN113343371 A CN 113343371A CN 202110127769 A CN202110127769 A CN 202110127769A CN 113343371 A CN113343371 A CN 113343371A
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negative poisson
poisson ratio
foam
core layer
ratio
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CN113343371B (en
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兰旭柯
黄广炎
张宏
吴广
袁梦琦
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Chongqing Innovation Center of Beijing University of Technology
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
    • G16C10/00—Computational theoretical chemistry, i.e. ICT specially adapted for theoretical aspects of quantum chemistry, molecular mechanics, molecular dynamics or the like
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
    • G16C60/00—Computational materials science, i.e. ICT specially adapted for investigating the physical or chemical properties of materials or phenomena associated with their design, synthesis, processing, characterisation or utilisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/26—Composites
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

The invention provides a design method of a foam-filled negative Poisson ratio composite structure, wherein the method determines materials adopted by a negative Poisson ratio core layer, a panel and a back plate based on an explosive load characteristic and a response mechanism of the composite structure, and designs the thickness of the panel, the thickness of the back plate and the thickness of the negative Poisson ratio core layer; simultaneously, according to a preset negative Poisson ratio effect, carrying out parameter design on the structure of the negative Poisson ratio core layer; and finally, filling the filled foam into the negative Poisson ratio core layer according to the relation between the preset bonding strength and the crushing strength of the foam material, and forming a foam filled negative Poisson ratio composite structure together with the panel and the back plate to realize the design of the foam filled negative Poisson ratio composite structure. The scheme realizes that the combination of the filling foam body and the negative Poisson ratio core layer has the characteristics of light weight and high strength, and has high energy absorption rate and low deformation under the action of explosive impact, and the material utilization rate is improved by simple compounding.

Description

Design method of foam-filled negative Poisson's ratio composite structure
Technical Field
The invention relates to the technical field of new materials, in particular to a design method of a foam-filled negative Poisson's ratio composite structure.
Background
Recent research shows that the negative Poisson's ratio effect can increase the impact strength of the structure, the energy absorption capacity is enhanced through the flowing of materials, and the material can be used for the anti-explosion design of a vehicle body, an anti-explosion fence and the like, but the structure failure mechanism and the failure mode are complex, and the influence factors are many. The existing research only aims at a hollow negative Poisson ratio structure, only utilizes material flow to increase energy absorption and impact resistance, has low space utilization rate, and does not research on coupling the foam material with the negative Poisson ratio effect. The foam-filled honeycomb structure can form more buckling and wrinkling on the wall surface of the cell under the action of explosive impact, the collapse of the filled foam can increase energy absorption, and the foam-filled honeycomb can weaken the amplitude of shock waves. The existing research only carries out simple compounding of the foam material and the honeycomb structure, the foam material is crushed only in a local impact area, and the material utilization rate is low.
Disclosure of Invention
In view of the above, it is necessary to provide a method for designing a foam-filled negative poisson's ratio composite structure.
A method of designing a foam-filled negative poisson's ratio composite structure, the method comprising: determining materials adopted by a negative Poisson ratio core layer, a panel and a back plate based on an explosive load characteristic and a response mechanism of a composite structure, wherein the negative Poisson ratio core layer consists of a plurality of negative Poisson ratio cells; designing the thickness of the face plate, the thickness of the back plate and the thickness of the negative Poisson ratio core layer based on the explosive load characteristic; according to a preset negative Poisson ratio effect, carrying out parameter design on the structure of the negative Poisson ratio core layer, wherein the parameter design comprises negative Poisson ratio cell type design, negative Poisson ratio cell shape and size design and foam filling material design; and filling the filled foam into the negative Poisson ratio core layer according to the relation between the preset bonding strength and the crushing strength of the foam material, and forming a foam filled negative Poisson ratio composite structure together with the panel and the back plate.
In one embodiment, the determining of the materials used for the negative poisson's ratio core layer, the face plate and the back plate based on the explosive load characteristic and the response mechanism of the composite structure specifically includes: based on the explosive load characteristic and the response mechanism of the composite structure, a high-wave impedance material is selected as a material for the negative Poisson's ratio core layer, a lower-wave impedance material is selected as a material for the panel, and a low-wave impedance material is selected as a material for the back plate.
In one embodiment, the designing of the panel thickness, the back panel thickness and the negative poisson's ratio core layer thickness based on the explosive load characteristic includes: based on the explosive load characteristic, designing the thickness of the panel according to the transmission load of the panel and the effect of the panel and the back plate on the full compression of the negative Poisson ratio core layer; based on the explosive load characteristic, designing the thickness of the back plate according to the supporting negative Poisson ratio core layer of the back plate and the full compression effect of the back plate and the panel on the negative Poisson ratio core layer; and designing the thickness of the negative Poisson ratio core layer based on the explosion load characteristic according to the relation between the wall thickness and the height of a preset negative Poisson ratio cell element and a preset structural response requirement.
In one embodiment, the negative poisson's ratio cell type design specifically includes: combining the easy filling property and the economical efficiency of various negative Poisson ratio cells, the negative Poisson ratio cells of the inner hexagon are selected as the units of the negative Poisson ratio core layer.
In one embodiment, the negative poisson's ratio cell is designed in shape and size, specifically: the size of the negative Poisson ratio cell comprises the height of the cell, the wall thickness of the cell and the internal concave angle of the cell, and the characteristic parameters of the negative Poisson ratio cell are formed according to the size of the negative Poisson ratio cell; and obtaining a fitting relation between the negative Poisson ratio value and the characteristic parameter through a quasi-static compression test, and selecting the negative Poisson ratio cell structure parameter with a high negative Poisson ratio value as the shape and the size of the negative Poisson ratio cell.
In one embodiment, the foam filling material is designed to be: and determining the crushing stress of the filled foam material according to the crushing stress of the negative Poisson ratio cell structure, namely determining the density design of the filled foam material, and realizing the design of the filled foam material.
In one embodiment, after the step of filling the filled foam into the negative poisson's ratio core layer according to the preset relationship between the bonding strength and the crushing strength of the foam material, and forming the foam-filled negative poisson's ratio composite structure together with the face plate and the back plate, the method further comprises the following steps: and analyzing the foam-filled negative Poisson's ratio composite structure by adopting a finite element analysis method, and checking the performance of the foam-filled negative Poisson's ratio composite structure.
According to the design method of the foam-filled negative Poisson ratio composite structure, the materials adopted by the negative Poisson ratio core layer, the panel and the back plate are determined based on the explosive load characteristic and the response mechanism of the composite structure, and the thickness of the panel, the thickness of the back plate and the thickness of the negative Poisson ratio core layer are designed based on the explosive load characteristic; simultaneously, according to a preset negative Poisson ratio effect, carrying out parameter design on the structure of the negative Poisson ratio core layer; finally, filling the filled foam into the negative Poisson ratio core layer according to the relation between the preset bonding strength and the crushing strength of the foam material, and forming a foam filled negative Poisson ratio composite structure together with the panel and the back plate to realize the design of the foam filled negative Poisson ratio composite structure; the parameter comprehensiveness of the foam-filled negative Poisson ratio composite structure is realized, the foam-filled negative Poisson ratio composite structure designed in the way meets the design requirement of explosion resistance, has the characteristics of low maximum variable, light weight and high energy absorption rate under the action of explosion impact load, and can provide an effective solution for the light-weight explosion resistance design of explosion-proof barrels, explosion-proof fences, explosion-proof walls, explosion-proof vehicles and the like; the filling foam body and the negative Poisson ratio core layer are combined to have the characteristics of light weight and high strength, and have high energy absorption rate and low deformation under the action of explosive impact, and the filling foam body and the negative Poisson ratio core layer are simply compounded, so that the material utilization rate is improved.
Drawings
FIG. 1 is a schematic flow chart of a method for designing a foam-filled negative Poisson's ratio composite structure according to one embodiment;
FIG. 2 is a schematic flow chart of a method for designing a foam-filled negative Poisson's ratio composite structure according to another embodiment;
FIG. 3 is a schematic diagram of a foam-filled negative Poisson's ratio composite structure according to one embodiment;
FIG. 4 is a schematic diagram of a negative Poisson ratio cell in one embodiment;
FIG. 5 is a diagram illustrating a negative Poisson ratio versus cell relationship fit in one embodiment;
FIG. 6 is a schematic diagram illustrating a comparison of compressive stress and strain between a foam-filled negative Poisson's ratio structure and a positive Poisson's ratio structure and their hollow structures in one embodiment.
In the attached drawings, a panel 1, a filling foam body 2, a negative Poisson ratio core layer 3 and a back plate 4 hcellIs the cell height, /)cellIs the cell length, tcThe cell wall thickness and theta are the cell recess angle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings by way of specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The application provides a design method of a foam-filled negative poisson ratio composite structure, the foam-filled negative poisson ratio composite structure is a sandwich composite plate as shown in fig. 3, and generally comprises four parts, namely a panel, a back plate, a negative poisson ratio hollow honeycomb core layer (namely the negative poisson ratio core layer in the text) and a filling foam body part, when an explosive shock wave and a detonation product impact and compress the front panel and the core layer, the negative poisson ratio honeycomb core layer generates a negative poisson ratio effect, the core layer contracts towards an impact center, the filling foam material can be compressed in the impact direction and the non-impact direction, and the deformation of the core layer and the crushing of the foam material are used for absorbing the explosive impact energy.
In one embodiment, as shown in FIG. 1, there is provided a method of designing a foam-filled negative Poisson's ratio composite structure, comprising the steps of:
s110, determining materials adopted by the negative Poisson ratio core layer, the panel and the back plate based on the explosive load characteristic and the response mechanism of the composite structure, wherein the negative Poisson ratio core layer is composed of a plurality of negative Poisson ratio cells.
Specifically, based on the explosive load characteristics and the response mechanism of the composite structure, the material characteristics of each layer are determined: the explosive load generally refers to shock waves and detonation products formed by explosive in air, and is characterized by high action peak value and short action time, so that the explosive load is fully transmitted to the core layer structure and then crushes the core layer to absorb energy, according to the relation between the reflection and the transmission of the shock waves, the panel is made of a low-wave impedance material, the core layer is made of a high-wave impedance material, and the back plate is made of a low-wave impedance material. And the negative Poisson ratio core layer is composed of a plurality of negative Poisson ratio cells.
In one embodiment, step S110 specifically includes: based on the explosive load characteristic and the response mechanism of the composite structure, a high-wave impedance material is selected as a material for the negative Poisson's ratio core layer, a lower-wave impedance material is selected as a material for the panel, and a low-wave impedance material is selected as a material for the back plate. Specifically, based on the explosive load characteristics and the response mechanism of the composite structure, the material characteristics of each layer are determined: the explosive load generally refers to shock waves and detonation products formed by explosive in air, and is characterized by high action peak value and short action time, so that the explosive load is fully transmitted to the core layer structure and then crushes the core layer to absorb energy, according to the relation between the reflection and the transmission of the shock waves, the panel is made of a low-wave impedance material, the core layer is made of a high-wave impedance material, and the back plate is made of a low-wave impedance material. The wave impedance characteristics of each layer should satisfy the following formula:
ρfaceDface≤ρcoreDcore (1)
where ρ isfaceAnd rhocoreDensity of the panel and core layer respectively; dfaceAnd DcoreThe velocity of the shock wave in the face sheet and core layer, respectively.
S120, designing the thickness of the face plate, the thickness of the back plate and the thickness of the negative Poisson ratio core layer based on the explosive load characteristics.
Specifically, each layer of structure is designed in thickness, and based on the explosive load characteristic and each layer of material characteristic and the like, the panel thickness, the core layer thickness and the backboard thickness are designed, so that the structure is ensured to have high energy absorption characteristic and lighter weight.
In one embodiment, step S120 specifically includes: based on the explosive load characteristic, the thickness of the panel is designed according to the transmission load of the panel and the effect of the panel and the back plate on the full compression of the negative Poisson ratio core layer; based on the explosion load characteristic, the thickness of the back plate is designed according to the supporting negative Poisson ratio core layer of the back plate and the full compression effect of the back plate and the panel on the negative Poisson ratio core layer; and designing the thickness of the negative Poisson ratio core layer based on the explosion load characteristic according to the relation between the wall thickness and the height of the preset negative Poisson ratio cell element and the preset structural response requirement. Specifically, each layer of structure is designed in thickness, and based on the explosive load characteristic and each layer of material characteristic and the like, the panel thickness, the core layer thickness and the backboard thickness are designed, so that the structure is ensured to have high energy absorption characteristic and lighter weight. The method comprises the following specific steps:
determining the thickness of the core layer
Foam filled honeycomb structure overall thickness HcoreAnd height h of single cellcellThe relationship of (a) to (b) is as follows:
Hcore＝N·hcell (2)
the effective occurrence of the negative Poisson ratio effect is a key point of the design of the anti-explosion impact performance of the structure, the core layer has a certain number of cell elements in the impact direction under the action of the explosion load so as to complete the structural response, and according to experimental research, when the core layer adopts an inwards concave hexagonal structure, the value range of N is more than or equal to 4.
To ensure a core layerThe plastic deformation is transmitted along the cell, i.e. the structural response is formed, the thickness t of the core layer cell wall surfacecAnd cell height hcellThe following relationship should be satisfied:
hcell＝k·tc (3)
when the common steel material is adopted, the k value range is more than or equal to 10.5 and less than or equal to 33.2; when the aluminum alloy material is adopted, k is within the value range of 10.5-15.8, and the common range of the core layer wall thickness is 0.25 mm-t to meet the requirements of processing and strengthc≤1mm。
② determining the thickness of the panel and the backboard
The composite structure transmits load to the core layer structure through the panel in the explosive shock response process, and the backboard plays a certain supporting role for the core layer structure, so that the core layer is fully compressed under the combined action of the panel and the backboard. The panel and the back plate are not used as main components for absorbing energy of the structure, and the lightweight property and the core layer surface density m of the panel and the back plate are mainly considered under the condition of meeting the structural strength designcThe surface densities of the front plate and the back plate are respectively mfAnd mbThe surface density ratio of the core layer to the core layer is as follows: m isf/mcLess than or equal to 0.2, namely the panel has smaller mass ratio; m is more than or equal to 0.15b/mcLess than or equal to 0.4, namely the mass ratio of the back plate is reduced under the condition of meeting the supporting strength of the core layer, and the thicknesses of the face plate and the back plate can be obtained by:
h＝m/ρ (4)
wherein m is the areal density of the material, and ρ is the density of the material given by the step one design.
S130, according to a preset negative Poisson ratio effect, carrying out parameter design on the structure of the negative Poisson ratio core layer, wherein the parameter design comprises negative Poisson ratio cell type design, negative Poisson ratio cell shape and size design and foam filling material design.
Specifically, the core layer structure parameters determine the negative poisson's ratio effect, deformation and failure modes of the core layer, are the main factors of the impact resistance of the foam-filled negative poisson's ratio composite structure, and include cell type design, cell shape and size design and filling foam material design, so that the optimal negative poisson's ratio effect and crushing energy absorption rate need to be achieved.
In one embodiment, the negative poisson' S ratio cell type design in step S130 specifically includes: and combining the easy filling property and the economical efficiency of various negative Poisson ratio cells, and selecting the negative Poisson ratio cells of the inner hexagon as the units of the negative Poisson ratio core layer. Specifically, the negative poisson's ratio cell is usually a two-dimensional concave hexagon, a double triangle, a chiral cell, etc., and the shape of the concave hexagon is selected as a core layer unit according to the manufacturing economy and the easy filling property of the cell, as shown in fig. 4.
In one embodiment, the negative poisson' S ratio cell shape and size design in step S130 includes: the size of the negative Poisson ratio cell element comprises the height of the cell element, the thickness of the cell element wall and the internal concave angle of the cell element, and the characteristic parameters of the negative Poisson ratio cell element are formed according to the size of the negative Poisson ratio cell element; and obtaining a fitting relation between the negative Poisson ratio value and the characteristic parameter through a quasi-static compression test, and selecting the negative Poisson ratio cell structure parameter with a high negative Poisson ratio value as the shape and the size of the negative Poisson ratio cell. Specifically, the cell size includes a cell length lcellCell height hcellWall thickness t of cellcThe cell recess angle θ, the cell characteristic value, can be determined by the following relationship:
ra＝lcell/hcell (5)
Figure RE-GDA0003176958690000061
wherein r isaLength to width ratio of cell element, rlIs the ratio of the concave part of the cell. The negative poisson's ratio value of a structure can be calculated by:
Figure RE-GDA0003176958690000062
fitting relation between the negative Poisson ratio and the characteristic parameters can be obtained through a quasi-static compression test, and the structure parameters of the high-negative Poisson ratio cell are selected as design parameters.
In one embodiment, the foam filling material design in step S130 is specifically: and determining the crushing stress of the filled foam material according to the crushing stress of the negative Poisson ratio cell structure, namely determining the density design of the filled foam material, and realizing the design of the filled foam material. Specifically, in order to ensure that the honeycomb structure generates a negative poisson ratio effect, the crushing stress of the foam material is determined according to the determined crushing stress of the honeycomb cell structure with the negative poisson ratio, namely the density design of the foam material is determined, the foam density under the explosive load can be described by adopting a rigid plastic hardening model, and the relationship between the density and the stress is as follows:
σcell＝σ0(ρ)+C(ρ)ε/(1-ε)2 (8)
wherein σcellThe crushing stress of the honeycomb cell is related to the cell parameter as follows:
Figure RE-GDA0003176958690000071
where ρ is*For core structure relative density, a is a polynomial fit function determined by the following relationship:
Figure RE-GDA0003176958690000072
wherein P is a polynomial coefficient given by fitting the compression experimental data, P00＝0.084，p10＝-3.21， p01＝1.82，p11＝-0.25，p20＝7.52，p02＝-2.54，p21＝3.07，p12＝-2.06，p30＝-6.12， p03＝1.75
σ0(rho) is the initial crush stress of the foam, C (rho) is the empirical hardening parameter, and epsilon is the foam strain. The relation between the initial crushing stress and hardening empirical parameters obtained by fitting the test data and the yield strength of the foam base material is as follows:
Figure RE-GDA0003176958690000073
wherein
Figure RE-GDA0003176958690000074
For the crushing strength of the foam base material, equations (6), (8), (9), (10) and (11) are associated, and the selected density of the filled foam can be given.
S140, filling the filled foam into the negative Poisson ratio core layer according to the relation between the preset bonding strength and the crushing strength of the foam material, and forming a foam filled negative Poisson ratio composite structure together with the panel and the back plate.
Specifically, the bonding strength between the foam and the cell wall surface needs to be controlled, the foam is filled foam, so that the foam is firmly bonded with the cell wall surface, debonding is not generated in the process of wall surface yielding and foam collapse, and deformation and energy absorption of the cell wall surface and the foam are ensured. Adhesive strength sigmabondThe following relationship should be satisfied with the foam crushing strength:
σbond≥τσ0 (12)
wherein sigma0And (4) the initial crushing stress of the foam material is given by the equation (11) in the step, wherein tau is a safety factor and takes a value of 1.5-2.
In one embodiment, as shown in fig. 2, step S140 is followed by:
s150, analyzing the foam-filled negative Poisson 'S ratio composite structure by adopting a finite element analysis method, and checking the performance of the foam-filled negative Poisson' S ratio composite structure.
Specifically, the foam-filled negative poisson's ratio composite structure designed in the above steps is analyzed by a finite element analysis method, and the explosion impact resistance of the foam-filled negative poisson's ratio composite structure is verified.
In the embodiment, the materials adopted by the negative poisson ratio core layer, the panel and the back plate are determined based on the explosive load characteristic and the response mechanism of the composite structure, and the thickness of the panel, the thickness of the back plate and the thickness of the negative poisson ratio core layer are designed based on the explosive load characteristic; simultaneously, according to a preset negative Poisson ratio effect, carrying out parameter design on the structure of the negative Poisson ratio core layer; finally, filling the filled foam into the negative Poisson ratio core layer according to the relation between the preset bonding strength and the crushing strength of the foam material, and forming a foam filled negative Poisson ratio composite structure together with the panel and the back plate to realize the design of the foam filled negative Poisson ratio composite structure; the parameter comprehensiveness of the foam-filled negative Poisson ratio composite structure is realized, the foam-filled negative Poisson ratio composite structure designed in the way meets the design requirement of explosion-resistant performance, has the characteristics of low maximum variable, light weight and high energy absorption rate under the action of explosion impact load, and can provide an effective solution for the light-weight explosion-resistant design of explosion-proof barrels, explosion-proof fences, explosion-proof walls, explosion-proof vehicles and the like.
In one embodiment, the negative poisson's ratio composite structure filled with foam specifically comprises four sections, wherein:
(1) wave impedance design
And selecting materials used by each layer according to a wave impedance design method of the explosion impact resistant composite structure. The panel and the back plate are made of 304 stainless steel materials and have low wave impedance values. The honeycomb core layer with the negative Poisson ratio is made of Al-3104-H19 aluminum alloy material and has a high wave impedance value. The filling foam material adopts rigid polyurethane foam and has extremely high wave impedance value. The wave impedance matching can reduce the shock wave load transmitted to the back plate and increase the absorption rate of the core layer to the explosion impact energy.
(2) Design of thickness of each layer
Based on a core layer thickness design method, taking the number N of the cells in the thickness direction to be 7; when the core layer is made of aluminum alloy material, the proportional coefficient k is 20, and the thickness t of the core layer isc0.3mm, the cell thickness h is thus obtainedcell6mm, core thickness Hcore42 mm. Thereby obtaining the thickness h of the panelf0.8mm, thickness h of the back plateb＝1.2mm。
(3) Core layer structure parameter design
Selecting concave hexagon as core layer unit, selecting r based on the relation between negative Poisson ratio and cell shape parameter in FIG. 5a＝1，rlThe cell structure which is 0.3 has higher negative Poisson ratio and meets the requirement of processing technique, and the height h of the cell is determined by thecell、ra、rl、tcCan completely determine the core layer cellA primitive shape.
According to the design of the foam filling material, the core layer is made of an aluminum alloy material, and when the foam filling material is made of a hard polyurethane foam material, the foam density is calculated to be rhofoam＝0.31g/cm3
(4) Composite mode design
Obtaining the foam yield strength sigma based on the composite mode design method and the foam material density given in the step (3)01.54Mpa, a safety factor tau of 1.8, and a bonding strength design sigmabound＝2.77Mpa
After the design, quasi-static compression tests of the negative Poisson ratio foam filling structure, the hollow negative Poisson ratio structure, the regular hexagonal honeycomb foam filling structure and the hollow regular hexagonal structure with equal density and thickness are carried out through finite element analysis software, and stress strain conditions are given, for example, as shown in FIG. 6. Therefore, under the same quality, the foam-filled negative Poisson ratio structure designed by the method can greatly improve the crushing stress value, can be effectively applied to the design of a light anti-explosion structure, replaces the common hollow regular hexagonal honeycomb and the foam-filled regular hexagonal honeycomb, and has higher energy absorption efficiency and impact resistance.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
It will be apparent to those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be centralized on a single computing device or distributed across a network of computing devices, and optionally they may be implemented in program code executable by a computing device, such that they may be stored on a computer storage medium (ROM/RAM, magnetic disks, optical disks) and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (7)

1. A design method of a foam-filled negative Poisson's ratio composite structure is characterized by comprising the following steps:
determining materials adopted by a negative Poisson ratio core layer, a panel and a back plate based on an explosive load characteristic and a response mechanism of a composite structure, wherein the negative Poisson ratio core layer consists of a plurality of negative Poisson ratio cells;
designing the thickness of the face plate, the thickness of the back plate and the thickness of the negative Poisson ratio core layer based on the explosive load characteristic;
according to a preset negative Poisson ratio effect, carrying out parameter design on the structure of the negative Poisson ratio core layer, wherein the parameter design comprises negative Poisson ratio cell type design, negative Poisson ratio cell shape and size design and foam filling material design;
and filling the filled foam into the negative Poisson ratio core layer according to the relation between the preset bonding strength and the crushing strength of the foam material, and forming a foam filled negative Poisson ratio composite structure together with the panel and the back plate.
2. The method according to claim 1, wherein the materials used for determining the negative poisson's ratio core layer, the face plate and the back plate are determined based on the explosive load characteristics and the response mechanism of the composite structure, and specifically are as follows:
based on the explosive load characteristic and the response mechanism of the composite structure, a high-wave impedance material is selected as a material for the negative Poisson's ratio core layer, a lower-wave impedance material is selected as a material for the panel, and a low-wave impedance material is selected as a material for the back plate.
3. The method of claim 1, wherein the panel thickness, the back panel thickness, and the negative poisson's ratio core thickness are designed based on the explosive loading characteristics by:
based on the explosive load characteristic, designing the thickness of the panel according to the transmission load of the panel and the effect of the panel and the back plate on the full compression of the negative Poisson ratio core layer;
based on the explosive load characteristic, designing the thickness of the back plate according to the supporting negative Poisson ratio core layer of the back plate and the full compression effect of the back plate and the panel on the negative Poisson ratio core layer;
and designing the thickness of the negative Poisson ratio core layer based on the explosion load characteristic according to the relation between the wall thickness and the height of a preset negative Poisson ratio cell element and a preset structural response requirement.
4. The method of claim 1, wherein the negative poisson's ratio cell type design is selected from the group consisting of:
combining the easy filling property and the economical efficiency of various negative Poisson ratio cells, the negative Poisson ratio cells of the inner hexagon are selected as the units of the negative Poisson ratio core layer.
5. The method of claim 4, wherein the negative Poisson ratio cell is sized by:
the size of the negative Poisson ratio cell comprises the height of the cell, the thickness of the cell wall and the internal concave angle of the cell, and the characteristic parameters of the negative Poisson ratio cell are formed according to the size of the negative Poisson ratio cell;
and obtaining a fitting relation between the negative Poisson ratio value and the characteristic parameter through a quasi-static compression test, and selecting the negative Poisson ratio cell structure parameter with a high negative Poisson ratio value as the shape and the size of the negative Poisson ratio cell.
6. The method according to claim 5, wherein the filled foam material is designed in particular as:
and determining the crushing stress of the filled foam material according to the crushing stress of the negative Poisson ratio cell structure, namely determining the density design of the filled foam material, and realizing the design of the filled foam material.
7. The method of claim 1, wherein after the step of filling the filled foam into the negative poisson's ratio core and forming a foam-filled negative poisson's ratio composite structure with the face sheet and the back sheet according to a predetermined relationship between bond strength and foam material crush strength, further comprising:
and analyzing the foam-filled negative Poisson's ratio composite structure by adopting a finite element analysis method, and checking the performance of the foam-filled negative Poisson's ratio composite structure.
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