Buffering energy-absorbing liner with spring effect and mechanical property

Abstract

The utility model discloses a buffering energy-absorbing liner with spring effect and mechanical property, which comprises buffering energy-absorbing cell elements, a plurality of buffering energy-absorbing cell elements are arranged and combined to form protective liners in different shapes, the buffering energy-absorbing cell elements are of elastic bending structures, the buffering energy-absorbing cell elements can resist compression deformation when being pressed, and the buffering energy-absorbing cell elements are not prone to deformation when being pressed. The buffering and energy-absorbing cell elements are made of thermoplastic polyurethane, polypropylene, polyvinyl chloride, polyethylene and polyethylene terephthalate materials, the upper surface and the lower surface of the buffering and energy-absorbing liner are of hollow structures, and the interiors of the buffering and energy-absorbing cell elements are of hollow structures. Compared with a traditional honeycomb, dot matrix and negative Poisson's ratio structure irreversible energy absorption mode through material plastic deformation and structure crushing, the structure of the scheme can absorb energy through elastic deformation of the structure within a very wide pressure range, the structure can automatically recover to the original shape after external force is eliminated, and the effect of repeated use is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of shock wave protection and buffer energy absorption, specifically relating to a buffer energy absorption pad with spring effect and mechanical properties. Background Technology

[0002] Fragments and blast waves are major threats on the battlefield. While rigid protective structures protect vital organs, these structures can deform transiently at the point of impact when penetrated by fragments, causing blunt force trauma. Therefore, it's necessary to add a buffer structure after the rigid ballistic layer to dissipate the remaining impact load. Impact protection is also crucial in sports, with elbows, knees, shoulders, ankles, hips, and other joints particularly vulnerable. Currently, porous materials and structures such as sponges, foams, honeycomb structures, and negative Poisson's ratio structures are commonly used as buffer structures. Under impact loads, these structures utilize their large deformation and low force transmission characteristics to absorb impact energy, preventing blunt force trauma.

[0003] However, in actual use, it was found that the above-mentioned buffer energy absorption structures still have some shortcomings: sponge and foam energy absorption structures have poor air flow and do not have the function of heat exchange, making it easy to sweat during wear; at the same time, the elastic deformation stage of conventional buffer energy absorption structures is too short, causing the load to rise rapidly in the initial stage of impact, forming an instantaneous overload, and strong impact loads can cause blunt force injury to the human body; honeycomb and negative Poisson's ratio structures absorb energy through local progressive buckling and destruction of the structure, which is an irreversible process and therefore cannot be reused.

[0004] To address the problems of conventional energy-absorbing buffer structures, patent application number 202310415381.9 discloses a repeatable, high-efficiency energy-absorbing spring-like superstructure. This structure uses hollow or filled tubes of circular, square, hexagonal, concave negative Poisson's ratio, self-locking, or other irregular cross-sectional shapes, spirally wound to form a buffer structure with the same shape as a spring. Compared to traditional energy-absorbing buffer structures, this structure achieves high-efficiency energy absorption and protection, and can be reused. Patent application number 201510587165.8 discloses a bulletproof vest and cushioning pad. This invention absorbs impact energy through an airbag structure. When impacted, the structure releases pressure through an air valve or absorbs impact energy through its own elasticity, preventing the user from being impacted.

[0005] While spring-like and airbag structures have solved some of the problems of conventional buffer and energy-absorbing structures, they still have the following drawbacks: some soft materials with limited elasticity cannot be bent and coiled into spring structures; at the same time, since springs have the characteristic that elastic force increases with the amount of deformation, the transmitted pressure will increase linearly with deformation; airbag structures need to prevent internal gas leakage, so the structural material is a non-porous, impermeable material. This type of material has poor breathability, making the human body prone to sweating and resulting in poor comfort. In addition, under high strain rate impact loads, the pressure relief effect of this structure cannot respond quickly, resulting in an unsatisfactory buffer and energy-absorbing effect. Summary of the Invention

[0006] In order to overcome the above-mentioned technical defects in the prior art, this utility model proposes a buffer energy-absorbing pad with spring effect and mechanical properties.

[0007] The technical solution to achieve the purpose of this utility model is as follows:

[0008] A buffer energy-absorbing liner with spring effect and mechanical properties includes buffer energy-absorbing cells, and multiple buffer energy-absorbing cells are arranged and combined to form protective liners of different shapes.

[0009] Furthermore, the buffer energy-absorbing cell is an elastic bending structure, which has the tendency to resist compression deformation and restore its original shape when compressed.

[0010] Furthermore, the buffer energy-absorbing cell is made of thermoplastic polyurethane, polypropylene, polyvinyl chloride, polyethylene, or polyethylene terephthalate.

[0011] Furthermore, the upper and lower surfaces of the buffer energy-absorbing pad have a hollow structure.

[0012] Furthermore, the interior of the buffer energy-absorbing cell has a hollow structure.

[0013] Compared with the prior art, the advantages of this utility model are as follows:

[0014] The buffer energy-absorbing cell in this scheme is designed as a bent structure. When compressed, the structure has the tendency to resist compression deformation and restore its original shape, thus giving the structure a spring effect and allowing it to be reused.

[0015] In the initial stage of compression, the energy-absorbing buffer cell exhibits mechanical properties similar to a spring, with a flat increase in stress-strain curve and a long elastic deformation stage. As the impact load continues to increase, the structure transitions from elastic energy absorption to plastic energy absorption, and the energy absorption curve does not show a high load peak. Therefore, within the effective energy absorption range, there will be no "hard-on-hard" situation.

[0016] Compared with traditional honeycomb, lattice and negative Poisson's ratio structures, which absorb energy through irreversible plastic deformation of materials and structural crushing, this structure absorbs energy through its own elastic deformation over a wide pressure range. After the external force is removed, the structure can restore its original shape and has the effect of repeated use.

[0017] By changing the cross-sectional shape, bending angle, number of bends, wall thickness, and arrangement density of energy-absorbing cells in the liner, the mechanical properties of the cells can be adjusted to meet different application scenarios.

[0018] Compared to negative Poisson's ratio energy-absorbing structures that can only be manufactured through 3D printing, this structure has a simple shape, can meet performance requirements through various manufacturing processes, and has low manufacturing costs.

[0019] Compared to traditional energy-absorbing structures such as foam and sponge, this structure is porous, which has good air permeability and heat exchange characteristics.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the buffer energy-absorbing pad structure with spring effect and mechanical properties in an embodiment of the present invention. In Figure 1(b), the bending angle of the cell in Figure 1(a) is changed; in Figure 1(c), the cell wall width of the cell in Figure 1(a) is changed; in Figure 1(d), the number of bends of the cell in Figure 1(a) is changed; and in Figure 1(e), the cross-sectional shape of the cell in Figure 1(a) is changed.

[0022] Figure 2 is a schematic diagram of the numerical simulation structure of the buffer energy-absorbing cell head under the action of compression load in the embodiment of this utility model, wherein Figure 2(a) is a schematic diagram of the compression model and Figure 2(b) is the stress-strain curve of the compression deformation and energy absorption process of the structure.

[0023] Figure 3 This is a schematic diagram of the compressive stress-strain curve of a traditional buffer energy-absorbing structure in the prior art.

[0024] Figure 4 This is a schematic diagram illustrating the deformation and recovery of a buffer energy-absorbing pad made of TPU material with spring effect and mechanical properties in an embodiment of this utility model.

[0025] Figure 5 This is a schematic diagram of a buffer energy-absorbing pad structure with spring effect and mechanical properties in an embodiment of this utility model. Detailed Implementation

[0026] It is readily understood that, based on the technical solution of this utility model, various embodiments of this utility model can be conceived by those skilled in the art without altering its essential spirit. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of this utility model or as a limitation or restriction on its technical solution. Rather, these embodiments are provided to enable those skilled in the art to gain a more thorough understanding of this utility model. Preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings, which constitute a part of this application and, together with the embodiments of this utility model, serve to illustrate the innovative concept of this invention. Example

[0027] Referring to Figure 1, a buffer energy-absorbing liner with spring effect and mechanical properties includes buffer energy-absorbing cells, and multiple buffer energy-absorbing cells are arranged and combined to form protective liners of different shapes.

[0028] The buffer energy-absorbing cell is an elastic bending structure, or a sawtooth structure. Multiple bent elastic materials are connected to the upper and lower surfaces of the buffer energy-absorbing cell to form a single cell structure.

[0029] In this embodiment, as shown in Figure 1, there is a hollow structure in which four bent serrated elastic materials connect the upper and lower surfaces. The bending angle, material thickness, cross-sectional shape, and wall thickness of the four serrated elastic materials are all the same.

[0030] When subjected to pressure, the buffer energy-absorbing cell has the tendency to resist compression deformation and restore its original shape. That is, when subjected to pressure, it can absorb energy through its own elastic deformation and restore its original shape after a certain range of pressure. Therefore, it has an effect similar to a spring and can be reused.

[0031] Under small-energy impacts, the structure absorbs energy through elastic deformation of its own structure and is recoverable after the energy is released. Under large-energy impacts, the structure can further absorb energy through its own plastic deformation and crushing, thus exhibiting highly efficient energy absorption characteristics.

[0032] During compression, the structure exhibits a gradual increase in stress and strain, and within the effective energy absorption range, there will be no extremely high stress peaks, thus avoiding a "hard-on-hard" phenomenon.

[0033] By adjusting key parameters such as the cross-sectional shape, bending angle, number of bends, and wall thickness of the energy-absorbing cell, the mechanical properties of the cell can be modified, thereby obtaining energy-absorbing structures that meet different application scenarios, such as... Figure 1a to Figure 1e As shown;

[0034] The buffer energy-absorbing cells are made of soft materials such as thermoplastic polyurethane (TPU), polypropylene (PP), polyvinyl chloride (PVC), polyethylene (PE), and polyethylene terephthalate (PET), and can be manufactured by 3D printing.

[0035] In addition, the upper and lower surfaces of the buffer energy-absorbing pad are hollowed-out, and the interior of each buffer energy-absorbing cell is also hollowed-out, thus providing excellent air permeability and heat exchange characteristics.

[0036] Figure 2(a) shows a schematic diagram of this structure under a uniformly distributed compressive load, where the lower end face is fixed and the upper end face is subjected to a downward displacement load of 2 mm / min. The material used for the energy-absorbing buffer structure is thermoplastic polyurethane (TPU) with a density of 1.13 g / cm³. The mechanical properties of the material are simulated using the hyperelastic constitutive Mooney-Rivlin model, with constitutive parameters C10 = 0.487859, C01 = 2.18994, and D1 = 0. The entire model employs the Lagrangian algorithm and is composed of solid elements.

[0037] When this structure is subjected to compressive load, initial compressive deformation occurs first, as shown in Figure 2(b). The stress-strain curve corresponding to this stage shows a roughly linear increasing trend, indicating that the structure is in the stage of recoverable elastic compressive deformation. With continued application of compressive load, the stress in the structure continues to rise, and the stress-strain curve corresponding to this stage shows a non-linear increasing trend, indicating that the structure has entered the stage of plastic deformation and energy absorption. As the load continues to increase, the structure exhibits crush deformation, and the stress-strain curve shows a decreasing trend. If compressive load continues to be applied, the structure is compressed to complete compaction, the stress curve rises rapidly, and the structure loses its buffering and energy absorption characteristics.

[0038] Figure 3 The figure shows the stress-strain curve of a traditional energy-absorbing buffer structure under impact load. When subjected to impact load, the stress of the traditional energy-absorbing structure rises rapidly, the elastic deformation range is small, and the elastic energy absorption effect of the structure is weak. As the load continues, the structure mainly absorbs impact energy through crushing and plastic deformation. Therefore, the structure is not reusable.

[0039] Figure 4 This refers to the process by which the structure deforms and returns to its original shape within its elastic range.

[0040] As the above analysis shows, this structure has excellent cushioning and energy absorption characteristics. Furthermore, its internal perforation makes it lightweight and breathable; therefore, this structure was chosen as the basic unit of the flexible pad. According to the protection requirements, the cushioning pad in this embodiment is as follows: Figure 5 As shown.

[0041] In this embodiment, the cushioning pad is processed using 3D printing technology, and the printing material is eSUN flexible TPE-83A with a material density of 1.14 g / cm3.

[0042] The above embodiments illustrate and describe the basic principles and main features of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A cushioning energy-absorbing pad having spring effect and mechanical properties, characterized in that, The cushioning and energy-absorbing cells are arranged in combination to form a protective cushion with different shapes. The cushioning and energy-absorbing cells are in elastic bending structure, and have a tendency to resist compression deformation and restore original shape when compressed. The cushioning and energy-absorbing cells are made of thermoplastic polyurethane, polypropylene, polyvinyl chloride, polyethylene or polyethylene terephthalate material.

2. The energy-absorbing cushion with spring effect and mechanical properties according to claim 1, characterized in that, The upper and lower surfaces of the cushioning and energy-absorbing cushion are in hollow structure.

3. The energy-absorbing cushion with spring effect and mechanical properties according to claim 1, characterized in that, The cushioning and energy-absorbing cells are in hollow structure.

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