Strength toughness synergistically controlled metamaterial structure and its bionic dual-phase design method

Abstract

The present application relates to a kind of strength toughness can be synergistically regulated material structure and its bionic two-phase design method, the material structure is the Bouligand helical stacking structure combined by soft phase material rod and hard phase material rod, the included angle of rod direction between two layers is 7.5 °~30 °, the number ratio of proportional hard phase material rod and soft phase material rod in the same level is 1:3~3:1.The present application is combined with two-phase design through the bionic structure in nature, make full use of the multiple synergistic mechanisms in energy dissipation such as significant interlayer coupling, effective stress transfer, twisted crack propagation, interface energy dissipation and crack path guidance between different phases, innovatively design bionic two-phase bouligand configuration, promote the innovation and development of bionic structure material design idea, provide ideas for solving the conflict between strength and toughness, provide solution for the combination of rigid and flexible protection.

Description

Technical Field

[0001] This invention relates to the field of metamaterial composite materials technology, and more specifically, to a biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness. Background Technology

[0002] Porous materials have attracted widespread attention due to their excellent mechanical properties and multifunctional characteristics, showing promising applications in lightweight load-bearing components, heat exchangers, and other fields. For centuries, researchers have strived to improve the strength of materials. However, material strengthening is often accompanied by a sharp decrease in toughness, resulting in low toughness in high-strength materials and low strength in high-toughness materials. Therefore, the traditional approach to developing high-strength and high-toughness materials has evolved into seeking a balance between strength and toughness.

[0003] Nature provides design references and inspiration for the synergistic balance between strength and toughness. Among these, the biomimetic Bouligand structure, the mechanical basis for the survival of many organisms, has been a research hotspot in recent years. This configuration increases the crack surface area, and the resulting modal oscillations enhance crack torsion. Through significant interlayer coupling, efficient stress transfer, and a mechanism for torsional crack propagation, it exhibits excellent performance characteristics. Although the mechanisms within the biomimetic Bouligand structure have been elucidated, the relatively simple material composition and underutilized interfacial energy dissipation suggest that further breakthroughs are possible in designs based on this structure. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a metamaterial structure with synergistically adjustable strength and toughness and its biomimetic two-phase design method, which combines the biomimetic Bouligand structure with the two-phase design to make full use of interfacial energy dissipation.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to construct a metamaterial structure whose strength and toughness can be synergistically controlled. The metamaterial is a Bouligand spiral stacked structure composed of soft phase material rods and hard phase material rods. The angle between the rod directions of the two layers is 7.5° to 30°. The ratio of the number of hard phase material rods to the number of soft phase material rods in the same layer is 1:3 to 3:1.

[0006] According to the above scheme, the soft phase material is thermoplastic polyurethane, and the hard phase material is polylactic acid.

[0007] This invention also provides a biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness, comprising the following steps:

[0008] S1. A dual-phase biomimetic Bouligand structure is obtained by combining the biomimetic Bouligand structure with the dual-phase design.

[0009] S2. Parametric design of interlayer angle and material ratio for this configuration; interlayer angle is the angle between the rod directions of two layers, and material ratio is the ratio of the number of rods of two materials in a layer. In parametric design, the angle range is controlled between 7.5° and 30°, and the ratio of hard phase to soft phase material is controlled between 1:3 and 3:1.

[0010] S3. Conduct experimental verification, numerical simulation verification, and practical application verification of the configuration.

[0011] According to the above scheme, in step S1, a biphase biomimetic Bouligand structure sample is prepared by fused filament fabrication printing. The sample is printed using a dual-nozzle printer, in which different materials are printed simultaneously by the left and right nozzles, ultimately producing a biphase biomimetic Bouligand structure.

[0012] According to the above scheme, the experimental verification steps in step S3 include:

[0013] S31A. Perform 3D modeling and melt filament fabrication on the designed configuration;

[0014] S32A, quasi-static compression, dynamic compression and three-point bending tests were conducted on the configuration respectively;

[0015] S33A: Record and export the experimental results using the equipment for analysis.

[0016] According to the above scheme, the numerical simulation verification step in step S3 includes:

[0017] S31B: Obtain constitutive models of material parameters for both soft and hard two-phase materials; for quasi-static compression models, uniaxial tensile tests are required on the materials, and dynamic mechanical analysis is required for the constitutive models of materials used in dynamic compression models.

[0018] S32B, aligning the configuration under different working conditions such as static compression, dynamic compression and three-point bending, performs 3D modeling and mesh generation, and sets appropriate boundary conditions;

[0019] S33B, Calculate and export the experimental results for analysis.

[0020] According to the above scheme, the quasi-static compression numerical simulation in step S32B includes:

[0021] The quasi-static compressive mechanical behavior was simulated using finite element software. A quasi-static compression geometric model was established, including two rigid plates and a target specimen. Contact was applied between the rigid plates and the target specimen, and a displacement load was applied to the upper rigid plate. The lower rigid plate was fixed, and the rigid plates and the structural specimen were discretized using elements.

[0022] According to the above scheme, the dynamic compression numerical simulation in step S32B includes:

[0023] The dynamic compressive mechanical behavior of the specimen was simulated using finite element software. A full-size SHPB model was established, including the specimen, bullet, incident rod, and transmission rod. Contact was applied between the rigid pressure plate and the target specimen, and a velocity load was applied to the bullet. The bullet, incident rod, and transmission rod were discretized using elements, and the elements of the structural specimen were the same as those used in the quasi-static loading.

[0024] According to the above scheme, the application verification step in step S3 includes:

[0025] S31C. A dual-phase biomimetic Bouligand structure was added to a regular insole to design a BDBM insole; S32C. The impact response spectrum of the BDBM insole under different parameters was compared and calculated.

[0026] S33C: Select a configuration with good performance and place a PVDF piezoelectric film sensor between the insole and heel to record dynamic real-time signals;

[0027] S34C outputs signal results and analyzes them.

[0028] In the biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness described in this invention, ...

[0029] In the biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness described in this invention, ...

[0030] The biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness, as described in this invention, has the following beneficial effects:

[0031] This invention utilizes biomimetic structures found in nature, combined with a two-phase design, to fully leverage multiple synergistic mechanisms in energy dissipation, such as significant interlayer coupling, effective stress transfer, torsional crack propagation, interfacial energy dissipation, and crack path guidance between different phases. It innovatively designs a biomimetic two-phase bouligand configuration, promoting innovation and development in biomimetic structural material design concepts, providing insights into resolving the conflict between strength and toughness, and offering solutions for combining rigid and flexible protection. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0033] Figure 1 This is a flowchart of the biomimetic two-phase design method for metamaterial structures with synergistic control over strength and toughness, as described in this invention.

[0034] Figure 2This is a schematic diagram of the biomimetic biphase Bouligand structure (BDBM);

[0035] Figure 3 This is a schematic diagram of the manufacturing process of the biomimetic two-phase Bouligand structure;

[0036] Figure 4 This is a schematic diagram of the interlayer angles and material ratios of the biomimetic two-phase Bouligand structure.

[0037] Figure 5 These are curves showing the results of quasi-static compression experiments and numerical simulations of the configuration.

[0038] Figure 6 These are curves showing the results of configuration dynamic compression experiments and numerical simulations;

[0039] Figure 7 These are the curves and SEM cross-sectional images of the three-point bending test results for the configuration;

[0040] Figure 8 This is a schematic diagram showing the change in voltage signal of BDBM insoles during rope skipping and running exercises. Detailed Implementation

[0041] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0042] Porous materials possess excellent mechanical properties and can be categorized into two configurations: tension-dominated and bending-dominated. Tensile-dominated porous materials are characterized by "high strength and low toughness," while bending-dominated porous materials are characterized by "low strength and high toughness." Strength and toughness represent a material's load-bearing capacity and fracture resistance, respectively, but high strength and high toughness are often mutually exclusive. Therefore, the traditional approach to developing high-strength and high-toughness materials has evolved into seeking a balance between strength and toughness.

[0043] The design principles for metamaterials with synergistically adjustable strength and toughness are as follows:

[0044] (1) Metamaterials need to make full use of multiple synergistic mechanisms of energy dissipation, namely, significant interlayer coupling, effective stress transfer, torsional crack propagation, interfacial energy dissipation and crack path guidance between different phases.

[0045] (2) Metamaterials need to find a balance between strength and toughness.

[0046] (3) Metamaterials have a two-phase design with both soft and hard phases.

[0047] Example 1

[0048] This invention provides a metamaterial structure with synergistically controllable strength and toughness. The metamaterial is a Bouligand spiral stacked structure composed of soft phase material rods and hard phase material rods. The angle between the rod directions of the two layers is 7.5° to 30°, and the ratio of the number of hard phase material rods to soft phase material rods within the same layer is 1:3 to 3:1. Preferably, in this embodiment, the soft phase material is thermoplastic polyurethane, and the hard phase material is polylactic acid.

[0049] Please see Figure 1 This invention provides a biomimetic dual-phase design method for metamaterial structures with synergistically controllable strength and toughness. The metamaterial is a Bouligand structure composed of soft and hard dual phases. The design steps of this structure include:

[0050] S1. A dual-phase biomimetic Bouligand structure (BDBM) is proposed by combining the biomimetic Bouligand structure (BM) with dual-phase design.

[0051] S2. Perform parametric design of the interlayer angles and material ratios for this configuration, such as... Figure 4 As shown, the interlayer angle is the angle between the rod directions of two layers, and the material ratio is the ratio of the number of rods of two materials within a layer. In parametric design, the angle range is controlled between 7.5° and 30°, and the ratio of hard phase to soft phase materials is controlled between 1:3 and 3:1.

[0052] S3. Conduct experimental verification, numerical simulation verification, and practical application verification of the configuration.

[0053] The BDBM structure obtained by the present invention through the above design steps can make full use of multiple synergistic mechanisms in energy dissipation, such as significant interlayer coupling, effective stress transfer, torsional crack propagation, interface energy dissipation, and crack path guidance between different phases.

[0054] In this embodiment, the experimental verification step in step S1 includes:

[0055] S11, such as Figure 2 As shown, inspired by the biomimetic Bouligand structure, this structure is combined with a two-phase design, and the soft phase and hard phase are combined to obtain the two-phase biomimetic Bouligand structure (BDBM).

[0056] S12, such as Figure 3 As shown, the sample was prepared using FFF (Fused Filament Fabrication) printing technology. The sample was printed using a dual-nozzle printer, where the left and right nozzles simultaneously print different materials, ultimately creating a biphasic biomimetic Bouligand structure.

[0057] In this embodiment, the experimental verification step in step S3 includes:

[0058] S31A. Perform 3D modeling and melt filament fabrication on the designed configuration;

[0059] S32A, quasi-static compression, dynamic compression and three-point bending tests were conducted on the configuration respectively;

[0060] S33A: Record and export the experimental results using the equipment for analysis.

[0061] In some embodiments of the present invention, the numerical simulation verification of step S3 includes:

[0062] S31B: Obtain constitutive models of material parameters for both soft and hard biphase materials. For the quasi-static compression model, uniaxial tensile tests are required, while for the dynamic compression model, dynamic mechanical analysis (DMA) is required.

[0063] S32B, aligning the configuration under different working conditions such as static compression, dynamic compression and three-point bending, performs 3D modeling and mesh generation, and sets appropriate boundary conditions;

[0064] S33B, Calculate and export the experimental results for analysis.

[0065] In some more specific embodiments of the present invention, the quasi-static compression numerical simulation in step S32B includes:

[0066] The quasi-static compressive mechanical behavior was simulated using finite element method (FEM) software. A quasi-static compression geometric model was established, consisting of two rigid plates and the target specimen. Appropriate contact was applied between the rigid plates and the target specimen, and a displacement load was applied to the upper rigid plate. The lower rigid plate was fixed, and appropriate elements were used to discretize both the rigid plates and the structural specimen.

[0067] In some more specific embodiments of the present invention, the dynamic compression numerical simulation in step S32B includes:

[0068] The dynamic compressive mechanical behavior was simulated using finite element method (FEM) software. A full-scale SHPB model was established, including the specimen, projectile, incident rod, and transmission rod. Appropriate contact was applied between the rigid platen and the target specimen, and a velocity load was applied to the projectile. The projectile, incident rod, and transmission rod were discretized using appropriate elements; the element set for the structural specimen was the same as that used in the quasi-static loading scenario.

[0069] In this embodiment, the step of practical application verification in step S3 includes:

[0070] S31C. A dual-phase biomimetic Bouligand structure was added to a regular insole to design a BDBM insole; S32C. The impact response spectrum of the BDBM insole under different parameters was compared and calculated.

[0071] S33C: Select a configuration with good performance and place a PVDF piezoelectric film sensor between the insole and heel to record dynamic real-time signals;

[0072] S34C outputs signal results and analyzes them.

[0073] The following specific examples illustrate the biomimetic two-phase design method and application effects of the aforementioned metamaterial with synergistically tunable strength and toughness.

[0074] Example 2

[0075] Please see Figure 2 , Figure 2 This is a schematic diagram of the dual-phase biomimetic Bouligand structure (BDBM). Through... Figure 2 As can be seen, inspired by the biomimetic Bouligand structure, this structure is combined with a two-phase design, combining the soft and hard phases to obtain a two-phase biomimetic Bouligand structure (BDBM), resulting in a metamaterial with synergistically tunable strength and toughness. The examples mainly illustrate the above-mentioned biomimetic two-phase design method for metamaterials with synergistically tunable strength and toughness, where the soft phase material is defined as thermoplastic polyurethane (TPU) and the hard phase material as polylactic acid (PLA). The specific steps are as follows:

[0076] (1) The original BDBM structure was designed with different interlayer angles and material ratios. The different interlayer angles included 7.5°, 15°, 22.5°, and 30°, and the different material ratios included 1:0, 0:1, 1:1, 2:1, 1:2, 3:1, and 1:3, thereby obtaining more different structural models.

[0077] (2) Regarding the configuration of the design, such as Figure 3 As shown, actual samples were prepared using FFF (Fused Filament Fabrication) printing technology for experiments.

[0078] (3) A quasi-static compression test was conducted on the configuration. The quasi-static compression test was performed on a universal testing machine with a certain loading speed. The engineering stress of the structure was calculated based on the compressive load data obtained from the sensors, while the engineering strain was calculated based on the original displacement data of the indenter.

[0079] (4) Quasi-static compression numerical simulation of the configuration. Uniaxial tensile tests were performed on PLA and TPU standard dog bone specimens, and the obtained performance curves were used as input for quasi-static compression simulation. The commercial finite element software ABAQUS / Explicit was used to simulate its quasi-static compression mechanical behavior. The experimental and numerical simulation results are as follows: Figure 5 As shown.

[0080] Depend on Figure 5The influence of angle reveals that the experimental and simulation results, particularly the interlayer angle, show a good agreement between the trends and numerical values, verifying that the simulation model can accurately simulate the mechanical response of the configuration under quasi-static compression. Under the influence of angle, the performance curves show an upward trend as the angle increases, with the curve characteristics changing from concave to convex. Furthermore, the trends at 15°, 22.5°, and 30° are similar to the numerical values. Besides the interlayer angle, material composition is also a crucial parameter affecting the structural mechanical properties. Figure 5 As can be seen from the influence of the proportion, the higher the proportion of PLA material, the better the performance of the structure.

[0081] (5) Dynamic compression tests were conducted on the configuration. The dynamic compression tests were carried out using the SHPB experimental setup. The SHPB system consists of a bullet, an incident rod, a transmission rod, and a specimen sandwiched between the two rods. The bullet impacts the incident rod at a certain velocity, outputting a pressure pulse, and the engineering stress-strain curve can be obtained through theoretical calculations.

[0082] (6) Dynamic compression numerical simulation of the configuration was performed. For the material parameters in the dynamic simulation, dynamic mechanical analysis (DMA) was conducted on PLA and TPU materials, using DMA test curves as input for the dynamic compression simulation. The quasi-static compressive mechanical behavior was simulated using the commercial finite element software ABAQUS / Explicit. The experimental and numerical simulation results are as follows: Figure 6 As shown.

[0083] Depend on Figure 6 The influence of materials shows that the experimental and simulation results are in good agreement with the trends and values ​​of the curves. The curves show an upward trend, reaching a maximum value and then decreasing. This is consistent with the typical curves of cellular materials under dynamic compression loading conditions, verifying that the simulation model can accurately simulate the mechanical response of the configuration under quasi-static compression. Figure 6 As can be seen from the influence of the interlayer angle, the dynamic compressive mechanical properties first increase and then decrease with increasing interlayer angle, reaching optimal performance at an interlayer angle of approximately 15°. Figure 6 As can be seen from the influence of the material ratio, the overall performance curve shows an increasing trend as the proportion of PLA material increases.

[0084] (7) Conduct a three-point bending test on the configuration. Based on... Figure 5 , Figure 6 Considering both static and dynamic compressive performance, three typical specimens—BM-P, BM-T, and BDBM-15°—were selected for three-point bending tests. The experimental results are as follows: Figure 7 As shown, by Figure 7 As shown in the curve, the BDBM-15° structure exhibits optimal performance characteristics in the middle position, indicating a balance between peak stress and peak strain. Furthermore, its deformation state is more ideal. Figure 7The SEM cross-sectional images show that the structure fractures at the PLA material location and exhibits significant deformation at the TPU material location. Under three-point bending, the BDBM mode demonstrates a relatively stable deformation state with multiple synergistic mechanisms, including significant interlayer coupling, effective stress transfer, torsional crack propagation, interfacial energy dissipation, and crack path guidance between different phases.

[0085] (8) Verification of the BDBM structure in practical applications. The impact response spectra (SRS) of BM-P, BM-T, and BDBM structures under different geometric parameters were compared. It was found that the SRS curve of the BDBM-15° configuration lies between that of BM-P and BM-T. Considering all factors... Figure 5 , Figure 6 , Figure 7 The performance result curves were used to verify the practical application of the BDBM mode.

[0086] (9) The BDBM insole is meticulously designed and printed for impact protection. A PVDF piezoelectric film sensor is placed between the insole and the heel to record dynamic real-time signals. The voltage signal changes during jump rope and running exercises are shown below. Figure 8 As shown, it can be observed that after adding BDBM insoles, the voltage signal amplitude decreases and the pulse width increases, indicating that the impact intensity experienced by the athlete during rope skipping is reduced and the adaptation time is extended, achieving a satisfactory personnel protection effect.

[0087] The results show that the strength and toughness synergistically modulated metamaterial of this invention effectively increases toughness with a small change in strength, achieving synergistic control of strength and toughness. This proves that the biomimetic two-phase design method proposed in this patent has significant effects.

[0088] The advantages of this invention are as follows:

[0089] 1. Under quasi-static and dynamic compressive loading conditions, the internal stress in the BDBM configuration is mainly distributed along the material deformation direction, between different phase interfaces, and between different layer interfaces. A large amount of energy is dissipated at the interfaces, exhibiting a significant interlayer coupling effect.

[0090] 2. In the three-point bending test, the BDBM configuration exhibits a balance between peak stress and peak strain. Furthermore, its deformation state is more ideal, with fracture occurring at the PLA location and significant deformation at the TPU location. Under these conditions, the BDBM configuration demonstrates a relatively stable deformation state and possesses multiple synergistic mechanisms, including significant interlayer coupling, effective stress transfer, torsional crack propagation, interfacial energy dissipation, and crack path guidance between different phases.

[0091] 3. Different BDBM configurations with different geometric parameters exhibit different impact response spectrum (SRS) curves and impact protection effects. Adding BDBM insoles reduces the voltage signal amplitude and increases the pulse width, indicating that athletes experience lower impact intensity and have a longer adaptation time when jumping rope or running on gravel surfaces, resulting in satisfactory personal protection.

[0092] In summary, this invention, through biomimetic structures found in nature and combined with a two-phase design, fully utilizes multiple synergistic mechanisms in energy dissipation, such as significant interlayer coupling, effective stress transfer, torsional crack propagation, interfacial energy dissipation, and crack path guidance between different phases, to innovatively design a biomimetic two-phase bouligand configuration. This promotes the innovation and development of biomimetic structural material design concepts, provides ideas for resolving the conflict between strength and toughness, and offers a solution for combining rigid and flexible protection.

[0093] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A metamaterial structure with synergistically adjustable strength and toughness, characterized in that, The metamaterial is a Bouligand spiral stacked structure composed of soft phase material rods and hard phase material rods. The angle between the rod directions of the two layers is 7.5° to 30°, and the ratio of the number of hard phase material rods to the number of soft phase material rods in the same layer is 1:3 to 3:

1.

2. The metamaterial structure with synergistically adjustable strength and toughness according to claim 1, characterized in that, The soft phase material is thermoplastic polyurethane, and the hard phase material is polylactic acid.

3. A biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness as described in claim 1, characterized in that, Includes the following steps: S1. Combining the biomimetic Bouligand structure with the dual-phase design, the configuration of the dual-phase biomimetic Bouligand structure is obtained. S2. Parametric design of interlayer angle and material ratio for this configuration; interlayer angle is the angle between the rod directions of two layers, and material ratio is the ratio of the number of rods of two materials in a layer. In parametric design, the angle range is controlled between 7.5° and 30°, and the ratio of hard phase to soft phase material is controlled between 1:3 and 3:

1. S3. Conduct experimental verification, numerical simulation verification, and practical application verification of the configuration.

4. The biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness according to claim 3, characterized in that, In step S1, a biphase biomimetic Bouligand structure sample is prepared by fused filament fabrication printing. The sample is printed using a dual-nozzle printer, in which different materials are printed simultaneously by the left and right nozzles, ultimately producing a biphase biomimetic Bouligand structure.

5. The biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness according to claim 3, characterized in that, The experimental verification steps in step S3 include: S31A. Perform 3D modeling and melt filament fabrication on the designed configuration; S32A, quasi-static compression, dynamic compression and three-point bending tests were conducted on the configuration respectively; S33A: Record and export the experimental results using the equipment for analysis.

6. The biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness according to claim 3, characterized in that, The numerical simulation verification step in step S3 includes: S31B: Obtain constitutive models of material parameters for both soft and hard two-phase materials; for quasi-static compression models, uniaxial tensile tests are required on the materials, and dynamic mechanical analysis is required for the constitutive models of materials used in dynamic compression models. S32B, aligning the configuration under different working conditions such as static compression, dynamic compression and three-point bending, performs 3D modeling and mesh generation, and sets appropriate boundary conditions; S33B, Calculate and export the experimental results for analysis.

7. The biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness according to claim 6, characterized in that, The quasi-static compression numerical simulation in step S32B includes: The quasi-static compressive mechanical behavior was simulated using finite element software. A quasi-static compression geometric model was established, including two rigid plates and a target specimen. Contact was applied between the rigid plates and the target specimen, and a displacement load was applied to the upper rigid plate. The lower rigid plate was fixed, and the rigid plates and the structural specimen were discretized using elements.

8. The biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness according to claim 6, characterized in that, The dynamic compression numerical simulation in step S32B includes: The dynamic compressive mechanical behavior of the specimen was simulated using finite element software. A full-size SHPB model was established, including the specimen, bullet, incident rod, and transmission rod. Contact was applied between the rigid pressure plate and the target specimen, and a velocity load was applied to the bullet. The bullet, incident rod, and transmission rod were discretized using elements, and the elements of the structural specimen were the same as those used in the quasi-static loading.

9. The biomimetic two-phase design method for metamaterial structures with synergistically adjustable strength and toughness according to claim 3, characterized in that, The application verification steps in step S3 include: S31C: The BDBM insole is designed by adding a dual-phase biomimetic Bouligand structure to a regular insole. S32C, Comparative calculation of the impact response spectrum of BDBM insoles under different parameters; S33C: Select a configuration with good performance and place a PVDF piezoelectric film sensor between the insole and heel to record dynamic real-time signals; S34C outputs signal results and analyzes them.

Images