Buffering mechanical metamaterial structure inspired by tensegrity
By designing a buffer mechanical metamaterial structure inspired by tensioned monolithic structures, and using rigid connections to constrain buckling beams, global load redistribution and coordinated deformation are achieved, solving the problem of strain hardening under axial compression in traditional tensioned monolithic structures, and realizing low impact load and efficient energy dissipation.
Patent Information
- Application Number
- CN202610122198.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-29
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional tensioned monolithic structures exhibit strain hardening response under axial compression, and their load-bearing capacity increases continuously with deformation. This makes it difficult to maintain a low and stable load level in the early stages of impact, resulting in difficulty in effectively suppressing the impact peak.
A tension-inspired buffer mechanical metamaterial structure is designed. By combining upper and lower buckling structures with connecting structures, and using rigid connections to constrain buckling beams, a quasi-zero stiffness mechanical response is formed, achieving global load redistribution and coordinated deformation, and avoiding stress concentration.
It provides linear support in the initial stage of impact, and then enters the constant force plateau region, efficiently dissipating kinetic energy, significantly suppressing the impact peak, and improving the stability and integrity of the structure.
Smart Images
Figure CN121701591A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cushioning materials technology, and in particular to a tension-inspired integral cushioning mechanical metamaterial structure. Background Technology
[0002] In high-tech fields such as aerospace and defense, protective structures must meet a crucial dual technical requirement: they must efficiently dissipate impact kinetic energy while effectively suppressing instantaneous peak loads during the impact process to ensure the integrity and functional reliability of the system structure. For example, in applications such as emergency landing of unmanned aerial vehicles (UAVs), if the impact peak is too high, the intense impact acceleration will be directly transmitted to critical components, potentially inducing structural damage or even systemic failure. Therefore, stringent requirements are placed on the performance of protective structures.
[0003] Traditional energy-absorbing structures, such as metal foams, polymer honeycomb structures, and thin-walled tubes, struggle to effectively balance these properties. While metal foams possess initial buffering capacity, they are prone to localized densification under high-energy impacts, leading to instability in the energy absorption process. In contrast, honeycomb and thin-walled tube structures rely on high structural stiffness for load-bearing and energy dissipation, but this inevitably results in significant peak loads at the initial stage of the impact. Therefore, the inherent contradiction between high stiffness load-bearing capacity and low peak load buffering is a technical bottleneck that these traditional structures struggle to overcome.
[0004] To address this issue, various mechanical metamaterial structures have been developed in this field. Among them, metamaterial structures with quasi-zero stiffness exhibit significant advantages in reducing peak impact due to their ability to maintain a nearly constant load response over a wide deformation range. However, most existing designs of such structures rely on local deformation mechanisms for energy dissipation, such as stress concentration or localized failure within elements. Under complex impact conditions, this design approach limits the overall stability and reliability of the structure.
[0005] Another type of structure used to improve system-level energy absorption performance is the tensioned monolithic structure. This structural paradigm achieves load redistribution through overall coordinated deformation, exhibiting excellent stability. However, under impact conditions dominated by axial compression, traditional tensioned monolithic structures typically exhibit strain-hardening response, meaning their load-bearing capacity continuously increases with increasing compressive deformation. This characteristic makes it difficult to maintain a low and stable load level during impact, especially in the initial stages, thus hindering effective suppression of the initial impact peak. Summary of the Invention
[0006] To address the technical problem that traditional tensioned monolithic structures often exhibit strain hardening response under axial compression, with load-bearing capacity continuously increasing with deformation, making it difficult to maintain a low and stable load level in the early stages of impact, this invention provides a tensioned monolithic-inspired buffer mechanical metamaterial structure.
[0007] The technical solutions provided by the embodiments of the present invention are as follows: The present invention provides a tension-inspired buffer mechanical metamaterial structure, comprising: an upper buckling structure, an upper connecting structure, a lower connecting structure, and a lower buckling structure; The upper buckling structure and the lower buckling structure are arranged vertically and respectively cover the outer sides of the upper connecting structure and the lower connecting structure, forming a flexible energy-absorbing body of the metamaterial structure; The elastic modulus of the upper connecting structure and the lower connecting structure is greater than the elastic modulus of the upper buckling structure and the lower buckling structure; Both the upper buckling structure and the upper connecting structure are circumferential array structures, each including buckling units and connecting units in a one-to-one correspondence. Each buckling unit includes: a support frame, a deformable body, a support base, and a connection interface; wherein, the support frame includes three support beams, the deformable body includes buckling beams, the connection interface includes an inner connection protrusion and an upper outer connection protrusion, and the support base includes a base. Each of the connecting units includes: a connecting portion for providing rigid support and a coupling portion for cooperating with the buckling unit; The inner connecting protrusion of the buckling unit forms an embedded coupling connection with the coupling portion of the connecting unit; Each upper external connecting protrusion of the upper buckling structure and each corresponding external connecting protrusion of the lower buckling structure are directly fixedly connected at the central plane of the metamaterial, forming an overall structure symmetrical about the horizontal central plane.
[0008] In one possible implementation, the upper buckling structure and the lower buckling structure have a rotationally symmetrical geometric configuration; the number of buckling units and the number of connecting units are both six, and they are distributed in a circumferentially equidistant array around the central vertical axis of the metamaterial.
[0009] In one possible implementation, in each of the buckling units, the three support beams construct a spatial triangular prism truss skeleton to establish the spatial volume and stiffness of the unit; the buckling beam is disposed within the space defined by the support beams, with one end connected to the inner frame formed by the support beams, and the other end extending and converging to the inner connecting protrusion and the upper outer connecting protrusion.
[0010] In one possible implementation, the buckling beam has a preset nonlinear geometric profile along the axial direction, specifically a sine or cosine waveform; the nonlinear geometric profile is configured to induce higher-order buckling mode deformation of the buckling beam under axial impact load, so as to prolong the stress plateau period and increase the energy dissipation density.
[0011] In one possible implementation, the buckling beam width L is 1-3 mm; the buckling beam height H is 2-4 mm; and the buckling beam thickness t is 1-2 mm.
[0012] In one possible implementation, the upper connecting structure and the lower connecting structure serve as rigid constraint cores, suspended within the cavities of the upper buckling structure and the lower buckling structure. The coupling part is constructed as a groove, which forms a closed mechanical interlock with the inner connecting protrusion; During the compression stroke, the upper and lower connecting structures restrict the radial displacement degree of freedom of the inner connecting protrusion, forcing the buckling beam to convert axial impact kinetic energy into elastic potential energy.
[0013] In one possible implementation, the upper outer connecting protrusion of the upper buckling structure and the lower outer connecting protrusion of the lower buckling structure are joined at the horizontal center plane of the metamaterial. The upper outer connecting protrusion of the upper buckling structure and the lower outer connecting protrusion of the lower buckling structure are fixedly connected by adhesive bonding or integrated additive manufacturing process, thereby forming a continuous force transmission link in the vertical direction.
[0014] In one possible implementation, the upper buckling structure and the lower buckling structure are made of thermoplastic elastomer material.
[0015] In one possible implementation, the thermoplastic elastomer material is thermoplastic polyurethane (TPU).
[0016] In one possible implementation, the upper and lower connecting structures are made of fiber-reinforced nylon material.
[0017] The beneficial effects of the technical solutions provided by the embodiments of the present invention include at least the following: (1) In this embodiment of the invention, the buckling beam is constrained by a rigid connection structure, transforming the originally unstable "capture-jump" negative stiffness behavior of the buckling beam into a macroscopically stable and controllable quasi-zero stiffness mechanical response. This response mechanism enables the structure to provide necessary linear support in the initial stage of compression, and then enters a long-stroke constant force plateau region. Within this plateau region, the structure can efficiently dissipate a large amount of kinetic energy while maintaining a low peak impact load, effectively solving the contradiction between "high stiffness leading to high overload" and "soft buffer leading to easy bottoming out" in traditional structures.
[0018] (2) In this embodiment of the invention, unlike traditional metamaterials that rely on local deformation, the present invention utilizes a "tensioned whole" network formed by an internal rigid connection structure to achieve global load redistribution. The rigid skeleton not only restricts the local instability and lateral expansion of the external flexible units, but also promotes coordinated deformation of the overall structure. This mechanism effectively avoids stress concentration during impact, prevents local collapse of the structure, and thus significantly improves the structural integrity of the metamaterial under dynamic impact. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic cross-sectional view of a tension-inspired integral buffer mechanical metamaterial provided in an embodiment of the present invention.
[0021] Figure 2 This is a schematic diagram of the overall three-dimensional structure of a tension-inspired buffer mechanical metamaterial, provided as an embodiment of the present invention.
[0022] Figure 3 This is a schematic diagram and a partial enlarged view of an upper buckling structure provided in an embodiment of the present invention.
[0023] Figure 4 This is a schematic diagram and a partial enlarged view of an upper-layer connection structure provided in an embodiment of the present invention.
[0024] Figure 5 This is a schematic diagram and a partial enlarged view of a lower-level connection structure provided in an embodiment of the present invention.
[0025] Figure 6 This is a schematic diagram and a partial enlarged view of a lower buckling structure provided in an embodiment of the present invention.
[0026] Figure 7 This is a schematic diagram of the compressive deformation process of a tension-inspired buffer mechanical metamaterial structure provided in an embodiment of the present invention.
[0027] Figure 8 The force-displacement response curve of a tension-inspired buffer mechanical metamaterial structure provided in this embodiment of the invention.
[0028] Reference numerals: 1-Upper buckling structure; 10-Buckling element; 11-Support beam; 12-Buckling beam; 13-Inner connecting protrusion; 14-Upper outer connecting protrusion; 15-Base; 2-Upper connecting structure; 20-Connecting element; 21-Coupled part; 22-Connecting part; 3-Lower connecting structure; 30-Lower connecting element; 31-Lower coupling part; 32-Lower connecting part; 4-Lower buckling structure; 40-Lower buckling element; 41-Lower support beam; 42-Lower buckling beam; 43-Lower inner connecting protrusion; 44-Lower outer connecting protrusion; 45-Lower base.
[0029] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation
[0030] The technical solutions of the present invention will now be described with reference to the accompanying drawings. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also use other alternative methods to implement the invention; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.
[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0032] like Figures 1 to 6 As shown, an embodiment of the present invention provides a tension-inspired buffer mechanical metamaterial structure, comprising: an upper buckling structure 1, an upper connecting structure 2, a lower connecting structure 3, and a lower buckling structure 4.
[0033] The upper buckling structure 1 and the lower buckling structure 4 are arranged vertically and respectively cover the outer sides of the upper connecting structure 2 and the lower connecting structure 3, forming a flexible energy-absorbing body of the metamaterial structure.
[0034] The elastic modulus of the upper connecting structure 2 and the lower connecting structure 3 is greater than that of the upper buckling structure 1 and the lower buckling structure 4.
[0035] Both the upper buckling structure 1 and the upper connecting structure 2 are circumferential array structures, each including a corresponding number of buckling units 10 and connecting units 20.
[0036] Each buckling unit 10 includes: a support frame, a deformable body, a support base, and a connection interface. The support frame includes three support beams 11, the deformable body includes a buckling beam 12, the connection interface includes an inner connecting protrusion 13 and an upper outer connecting protrusion 14, and the support base includes a base 15.
[0037] Each connection unit 20 includes a connection portion 22 for providing rigid support and a coupling portion 21 for cooperating with the buckling unit 10.
[0038] The inner connecting protrusion 13 of the buckling unit 10 forms an embedded coupling connection with the coupling part 21 of the connecting unit 20.
[0039] Each upper external connecting protrusion 14 of the upper buckling structure 1 and the corresponding external connecting protrusion of the lower buckling structure 4 are directly fixedly connected at the central plane of the metamaterial, forming an overall structure symmetrical about the horizontal central plane.
[0040] In this embodiment of the invention, the buckling beam is constrained by a rigid connection structure, transforming the originally unstable "capture-jump" negative stiffness behavior of the buckling beam into a macroscopically stable and controllable quasi-zero stiffness mechanical response. This response mechanism enables the structure to provide necessary linear support in the initial stage of compression, and then enters a long-stroke constant force plateau region. Within this plateau region, the structure can efficiently dissipate a large amount of kinetic energy while maintaining a low peak impact load, effectively resolving the contradiction in traditional structures where "high stiffness leads to high overload" and "soft buffer leads to easy bottoming out."
[0041] Furthermore, unlike traditional metamaterials that rely on local deformation, this invention utilizes a "tensioned whole" network formed by an internally rigid connecting structure to achieve global load redistribution. The rigid framework not only restricts local instability and lateral expansion of the external flexible units but also promotes coordinated deformation of the entire structure. This mechanism effectively avoids stress concentration during impact, prevents local structural collapse, and thus significantly improves the structural integrity of the metamaterial under dynamic impact.
[0042] In this embodiment of the invention, the upper buckling structure 1 and the lower buckling structure 4 exhibit a rotationally symmetrical geometric configuration.
[0043] It should be noted that the rotationally symmetric geometric configuration ensures that the upper buckling structure 1 and the lower buckling structure 4 possess consistent mechanical and geometric properties in the circumferential direction. This guarantees that under axial compression and impact loads, each buckling unit can synchronously enter the buckling and deformation state, avoiding eccentric loading, torsion, or premature local instability caused by circumferential inhomogeneity. This configuration facilitates the uniform distribution of impact loads along the circumferential direction to each buckling unit and connecting unit, achieving overall coordinated deformation and a stable quasi-zero stiffness response platform. Simultaneously, it effectively suppresses lateral expansion and structural eccentric deformation, improving the structural stability, repeatability, and energy absorption reliability of the metamaterial under complex dynamic impact conditions.
[0044] In this embodiment of the invention, there are six buckling units 10 and six connecting units 20, which are distributed in a circumferentially spaced array around the central vertical axis of the metamaterial.
[0045] It should be noted that setting the number of buckling elements 10 and connecting elements 20 to six, and distributing them in a circumferentially evenly spaced array around the central vertical axis of the metamaterial, helps to ensure the rotational symmetry of the structure while achieving uniform load distribution in the circumferential direction. This allows each buckling element to participate in deformation and energy dissipation simultaneously under axial compression or impact conditions, avoiding local overload caused by too few elements or increased structural complexity and manufacturing costs caused by too many elements. Simultaneously, the six-element array can form a stable polygonal force-bearing frame in space, which, together with the internal connecting structure, constitutes a highly stable overall force-bearing network, effectively suppressing eccentric compression and torsional deformation, and improving the overall stability, repeatability, and mechanical response consistency of the metamaterial structure.
[0046] In this embodiment of the invention, in each buckling unit 10, three support beams 11 construct a spatial triangular prism truss skeleton to define the spatial volume and stiffness of the unit. The buckling beam 12 is disposed within the space defined by the support beams 11, with one end connected to the inner frame formed by the support beams 11, and the other end extending and converging to the inner connecting protrusion 13 and the upper outer connecting protrusion 14.
[0047] It should be noted that using a spatial triangular prism truss framework instead of solid walls not only reduces the overall weight but also provides ample space for the lateral deformation of the internal buckling beams 12, avoiding structural interference during compression. In each buckling unit 10, a spatial triangular prism truss framework is constructed through three support beams 11 to define the unit's spatial volume and provide stable foundation stiffness, effectively bearing the initial load and suppressing overall instability during axial compression. Simultaneously, the buckling beams 12 are arranged within the space defined by this truss framework, allowing them to undergo controllable buckling deformation under constrained conditions. This avoids interference with the external structure during buckling and, by converging the deformed ends of the buckling beams and connecting them to the inner connecting protrusion 13 and the upper outer connecting protrusion 14, achieves efficient transfer and centralized control of axial loads to the buckling beams. This ensures overall structural stability while fully releasing the large deformation energy dissipation capacity of the buckling beams, improving the unit's energy absorption efficiency and mechanical response consistency.
[0048] In this embodiment of the invention, the buckling beam 12 has a preset nonlinear geometric profile along the axial direction, specifically manifested as a sine wave or a cosine wave. The nonlinear geometric profile is configured to induce higher-order buckling mode deformation in the buckling beam 12 under axial impact load, thereby prolonging the stress plateau period and increasing the energy dissipation density.
[0049] In this embodiment of the invention, the buckling beam width L is 1-3 mm. The buckling beam height H is 2-4 mm. The buckling beam thickness t is 1-2 mm.
[0050] Compared to straight beams, wave profiles can smooth the transition of the structure into buckling, avoid sudden load drops, and thus effectively extend the stress plateau period and increase energy dissipation density.
[0051] In this embodiment of the invention, the upper connecting structure 2 and the lower connecting structure 3 serve as rigid constraint cores, suspended within the cavities of the upper buckling structure 1 and the lower buckling structure 4. The coupling portion 21 is constructed as a groove, forming a closed mechanical interlock with the inner connecting protrusion 13. During the compression stroke, the upper connecting structure 2 and the lower connecting structure 3 restrict the radial displacement degree of freedom of the inner connecting protrusion 13, forcing the buckling beam 12 to convert its axial impact kinetic energy into elastic potential energy.
[0052] It should be noted that this mechanical interlocking mechanism allows the internal rigid frame to restrict the radial displacement degree of freedom of the inner connecting protrusion 13 during the compression stroke, forcing the buckling beam 12 to convert the axial impact kinetic energy into elastic potential energy, thus preventing slippage or failure at the connection.
[0053] In this embodiment of the invention, the upper outer connecting protrusion 14 of the upper buckling structure 1 and the lower outer connecting protrusion 44 of the lower buckling structure 4 are joined at the horizontal center plane of the metamaterial. The upper outer connecting protrusion 14 of the upper buckling structure 1 and the lower outer connecting protrusion 44 of the lower buckling structure 4 are fixedly connected by adhesive bonding or an integrated additive manufacturing process, thereby forming a continuous force transmission link in the vertical direction.
[0054] It should be noted that by connecting and fixing the upper external connecting protrusion 14 of the upper buckling structure 1 and the lower external connecting protrusion 44 of the lower buckling structure 4 at the horizontal center plane of the metamaterial, a continuous and symmetrical force transmission link is formed between the upper and lower buckling structures in the vertical direction. This facilitates the stable and uninterrupted transmission of axial loads to each buckling unit during impact or compression, avoiding sudden load changes and stress concentrations caused by interface relaxation or relative slippage. Simultaneously, the rigid connection achieved through adhesive bonding or integrated additive manufacturing significantly improves the integrity and consistency of the upper and lower structures, promoting the coordinated buckling and energy dissipation of the upper and lower buckling beams, thereby enhancing the overall stability, mechanical response continuity, and controllability of the energy absorption process of the metamaterial structure.
[0055] In this embodiment of the invention, the upper buckling structure 1 and the lower buckling structure 4 are made of a thermoplastic elastomer material. The thermoplastic elastomer material is thermoplastic polyurethane (TPU). The upper connecting structure 2 and the lower connecting structure 3 are made of fiber-reinforced nylon material.
[0056] It should be noted that by using thermoplastic elastomers such as TPU to fabricate the buckling structure, their high resilience ensures that the structure can recover after impact. Meanwhile, using high-modulus fiber-reinforced nylon to fabricate the connecting structure provides robust boundary constraints for the external flexible structure.
[0057] like Figures 7 to 8 As shown, the working process of a tension-inspired integral buffer mechanical metamaterial provided by this invention is as follows: When the metamaterial unit structure is subjected to a compressive load along its central axis, the load is first applied to the bases 15 and 45 of the upper and lower buckling units 10 and 40, and then transferred to the support beams 11 and 41.
[0058] As the compressive displacement increases, the load is transferred to buckling beams 12 and 42. When the load reaches the preset critical buckling load, the originally outwardly convex buckling beams 12 and 42 will undergo inward buckling deformation. During buckling, the stiffness of the structure will decrease sharply, and even a negative stiffness region will appear. This negative stiffness effect caused by structural buckling, combined with the positive stiffness of the frame structure itself such as support beams 11 and 41, makes the overall tangential stiffness of the entire unit structure almost zero over a relatively wide deformation stroke, thus forming a low and stable force-displacement plateau, that is, achieving a quasi-zero stiffness response.
[0059] It is precisely because of this quasi-zero stiffness response that this structure can suppress the peak force to a low level when subjected to impact, while dissipating a large amount of impact energy through the large deformation of buckling beams 12 and 42, thus achieving both low impact and high energy absorption protection.
[0060] Furthermore, when multiple units are connected into an array or network structure, the interaction between the units can effectively transfer and redistribute the load throughout the entire macrostructure, similar to the global synergistic deformation effect of a tensioned overall structure. This avoids local failure of a single unit due to stress concentration, and significantly improves the stability and reliability of the overall structure.
[0061] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.
[0062] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A tension-inspired, integrally-stretched buffer mechanical metamaterial structure, characterized in that, include: Upper buckling structure, upper connecting structure, lower connecting structure, and lower buckling structure; The upper buckling structure and the lower buckling structure are arranged vertically and respectively cover the outer sides of the upper connecting structure and the lower connecting structure, forming a flexible energy-absorbing body of the metamaterial structure; The elastic modulus of the upper connecting structure and the lower connecting structure is greater than the elastic modulus of the upper buckling structure and the lower buckling structure; Both the upper buckling structure and the upper connecting structure are circumferential array structures, each including buckling units and connecting units in a one-to-one correspondence. Each buckling unit includes: a support frame, a deformable body, a support base, and a connection interface; wherein, the support frame includes three support beams, the deformable body includes buckling beams, the connection interface includes an inner connection protrusion and an upper outer connection protrusion, and the support base includes a base. Each of the connecting units includes: a connecting portion for providing rigid support and a coupling portion for cooperating with the buckling unit; The inner connecting protrusion of the buckling unit forms an embedded coupling connection with the coupling portion of the connecting unit; Each upper external connecting protrusion of the upper buckling structure and each corresponding external connecting protrusion of the lower buckling structure are directly fixedly connected at the central plane of the metamaterial, forming an overall structure symmetrical about the horizontal central plane.
2. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, The upper buckling structure and the lower buckling structure have a rotationally symmetrical geometric configuration; the number of buckling units and the number of connecting units are both six, and they are distributed in a circumferentially equally spaced array around the central vertical axis of the metamaterial.
3. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, In each buckling unit, the three supporting beams construct a spatial triangular prism truss skeleton to establish the spatial volume and stiffness of the unit; the buckling beam is disposed within the space defined by the supporting beam, with one end connected to the inner frame formed by the supporting beam, and the other end extending and converging to the inner connecting protrusion and the upper outer connecting protrusion.
4. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, The buckling beam has a preset nonlinear geometric profile along the axial direction, specifically manifested as a sine wave or a cosine wave; the nonlinear geometric profile is configured to induce higher-order buckling mode deformation of the buckling beam under axial impact load, so as to prolong the stress plateau period and increase the energy dissipation density.
5. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, The buckling beam width L is 1-3mm; the buckling beam height H is 2-4mm; and the buckling beam thickness t is 1-2mm.
6. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, The upper and lower connecting structures serve as rigid constraint cores, suspended within the cavities of the upper and lower buckling structures. The coupling part is constructed as a groove, which forms a closed mechanical interlock with the inner connecting protrusion; During the compression stroke, the upper and lower connecting structures restrict the radial displacement degree of freedom of the inner connecting protrusion, forcing the buckling beam to convert axial impact kinetic energy into elastic potential energy.
7. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, The upper outer connecting protrusion of the upper buckling structure and the lower outer connecting protrusion of the lower buckling structure are joined at the horizontal center plane of the metamaterial. The upper outer connecting protrusion of the upper buckling structure and the lower outer connecting protrusion of the lower buckling structure are fixedly connected by adhesive bonding or integrated additive manufacturing process, thereby forming a continuous force transmission link in the vertical direction.
8. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, The upper buckling structure and the lower buckling structure are made of thermoplastic elastomer material.
9. The tension-inspired integral buffer mechanical metamaterial structure according to claim 8, characterized in that, The thermoplastic elastomer material is thermoplastic polyurethane (TPU).
10. The tension-inspired integral buffer mechanical metamaterial structure according to claim 1, characterized in that, The upper and lower connecting structures are made of fiber-reinforced nylon material.