Mirror image curved surface polyhedron impact protection structure and energy absorption structure

Abstract

The embodiment of the invention provides a mirror image curved surface polyhedral impact protection structure and an energy absorption structure, and belongs to the technical field of energy absorption structures, and the mirror image curved surface polyhedral impact protection structure comprises two protection units stacked in the first direction; the protection unit comprises N protection surfaces with thicknesses, the N protection surfaces are connected in pairs, and the protection surfaces are configured to be continuous curved surfaces formed by moving and rotating the bottom edges in the first direction; wherein N is larger than or equal to 3, the two protection units comprise a first unit and a second unit, and the first unit and the second unit are arranged in a mirror symmetry mode relative to the middle connecting face. According to the mirror image curved surface polyhedral impact protection structure and the energy absorption structure provided by the embodiment of the invention, the bearing capacity and the absorption efficiency of the energy absorption structure can be improved.

Description

Technical Field

[0001] This application relates to the field of energy-absorbing structure technology, and more specifically, to a mirror-shaped curved polyhedral impact protection structure and an energy-absorbing structure. Background Technology

[0002] In recent years, lightweight and efficient energy-absorbing structures have been widely studied and applied due to their ability to absorb large amounts of impact energy under impact, collision, or explosive loads. Common buckling-type energy-absorbing structures include honeycomb, lattice, and origami tubes, whose energy absorption mainly relies on the bending or buckling instability deformation of the microstructure. Although these structures can provide high initial load-bearing capacity before buckling, they suffer from problems such as severe load fluctuations, strain concentration, and plateau instability after buckling, which limits their overall energy absorption performance and efficiency. Summary of the Invention

[0003] This application provides a mirror-shaped curved polyhedral impact protection structure and an energy-absorbing structure, aiming to improve the load-bearing capacity and absorption efficiency of the energy-absorbing structure.

[0004] The first aspect of this application provides a mirrored curved surface polyhedral impact protection structure, including: Two protective units are stacked along the first direction; The protective unit includes N protective surfaces with thickness, the N protective surfaces are connected in pairs, and the protective surfaces are configured as a continuous curved surface formed by moving and rotating the bottom edge in the first direction; Wherein, N is greater than or equal to 3, and the two protective units include a first unit and a second unit, wherein the first unit and the second unit are arranged in a mirror-symmetric manner about the intermediate connecting surface.

[0005] Optionally, the bottom edge is a straight edge or a curved edge.

[0006] Optionally, the protective unit is provided with reinforcing rings on both ends of the first direction, and the shape of the reinforcing rings is adapted to the shape of the protective unit.

[0007] Optionally, the width of the reinforcing ring is greater than the thickness of the protective surface.

[0008] Optionally, an opening is provided on at least one protective surface of the protective unit.

[0009] Optionally, the opening is located in the central region of the protective surface.

[0010] Optionally, the shape of the opening includes a circle, an ellipse, and a polygon.

[0011] Optionally, the material of the protective unit may include metallic materials or polymeric materials.

[0012] The second aspect of this application provides an energy-absorbing structure, including the mirror-shaped curved polyhedral impact protection structure as provided in the first aspect of this application.

[0013] Optionally, the plurality of the protective structures are periodically distributed; Alternatively, the multiple protective structures may be distributed in a gradient manner; Alternatively, the multiple protective structures may be distributed in a disordered manner.

[0014] Beneficial effects: This application provides a mirror-shaped curved polyhedral impact protection structure and an energy absorption structure. The protection structure includes two protection units, each of which has N protection surfaces. The protection surfaces are configured as continuous curved surfaces formed by moving and rotating the bottom edge in a first direction. Meanwhile, the two protection units are mirror-symmetrically distributed about the intermediate connecting surface in the first direction. Thus, the protection structure provided by this application can achieve higher load-bearing capacity and energy absorption efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the formation process of a mirror-shaped curved polyhedral impact protection structure according to an embodiment of this application; Figure 2 This is a comparison curve of a mirror-shaped curved polyhedral impact protection structure proposed in an embodiment of this application and energy-absorbing structures in related technologies; Figure 3 This is a schematic diagram illustrating the formation process of a mirror-shaped polyhedral impact protection structure with a stiffened ring, according to an embodiment of this application. Figure 4 This is a schematic diagram of a mirror-shaped curved polyhedral impact protection structure with four protective surfaces, as proposed in an embodiment of this application. Figure 5 This is a schematic diagram of another mirror-shaped polyhedral impact protection structure with four protective surfaces proposed in an embodiment of this application; Figure 6 This is a schematic diagram of a mirror-shaped curved polyhedral impact protection structure with five protective surfaces, as proposed in an embodiment of this application. Figure 7 This is a schematic diagram of a mirror-shaped curved polyhedral impact protection structure with six protective surfaces, as proposed in an embodiment of this application. Figure 8 This is a schematic diagram of another mirror-shaped polyhedral impact protection structure with six protective surfaces proposed in an embodiment of this application; Figure 9 This is a schematic diagram of a mirror-shaped curved polyhedral impact protection structure with eight protective surfaces, as proposed in an embodiment of this application. Figure 10 This is a schematic diagram of a mirror-shaped curved polyhedron impact protection structure with an opening, as proposed in one embodiment of this application. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Energy-absorbing structures in related technologies mostly rely on buckling deformation mechanisms to absorb energy. Buckling structures have high load-bearing capacity in the initial loading stage, but they have the following prominent problems: 1. Local instability and strain concentration: Once buckling occurs, it will cause abrupt changes in the geometric shape of the structure, causing stress to concentrate in a few local areas and resulting in low material utilization.

[0019] 2. Severe fluctuations in load response: Buckling causes a sudden drop in bearing capacity, resulting in a significant peak force on the force-displacement curve. The plateau segment is unstable, the curve fluctuates greatly, and it deviates from the ideal energy absorption curve.

[0020] 3. Low energy absorption efficiency: During the buckling stage, only a small area participates in deformation, and most of the structure enters the densification stage before it has fully worked, resulting in low specific energy absorption and energy absorption efficiency.

[0021] In view of this, this application proposes a mirror-shaped curved polyhedral impact protection structure and an energy-absorbing structure, aiming to improve the load-bearing capacity and absorption efficiency of the energy-absorbing structure.

[0022] Reference Figure 1 and Figure 4 As shown, this application discloses a mirror-shaped curved polyhedron impact protection structure, which includes two protection units 10 arranged along the first direction X.

[0023] Specifically, the protective unit 10 includes N protective surfaces 101, and the N protective surfaces 101 are connected in pairs. It is understood that in the embodiments of this application, the protective surfaces 101 of the protective unit 10 are only proposed for ease of description. In actual products, the protective surface 101 is a plate with thickness, and the protective surfaces 101 of the protective unit 10 are connected in pairs to form a closed polygonal structure.

[0024] Meanwhile, the protective surface 101 is configured as a continuous curved surface formed by moving and rotating its bottom edge in a first direction. The bottom edge is a structure that exists as the foundation of the protective surface 101 during its formation. The length direction of the bottom edge is also the width direction of the protective surface 101, and the width of the bottom edge is also the thickness direction of the protective surface 101. The protective surface 101 can be considered as being composed of multiple bottom edges stacked in the first direction X. The first direction X is the direction of the impact force when the protective structure is subjected to an impact. Moving and rotating the bottom edge along the first direction X yields a continuous curved surface, which is the protective surface 101.

[0025] In this embodiment, the two protective units 10 include a first unit 11 and a second unit 12. The first unit 11 and the second unit 12 have the same shape and are mirror-symmetrically arranged about an intermediate connecting surface. The intermediate connecting surface refers to the plane where the first unit 11 and the second unit 12 are connected.

[0026] Reference Figure 1 As shown, the formation process of the protective structure provided in this application embodiment is as follows: First, based on concentrically arranged arbitrary curved or straight polygons, a basic curved polyhedron structure is obtained by sweeping along an axis perpendicular to the polygon's surface and applying a rotation operation. Here, parameter t represents the thickness of the concentric polygon, b represents the sweep height, and θ represents the rotation angle. The boundaries of the polygons can be straight lines or curves of arbitrary functional form, with the number of sides ranging from 3 to infinite. The base edge is any edge of the polygon, which can be a straight edge or a curved edge.

[0027] Subsequently, the upper surface of the structure is mirrored to obtain a mirror-symmetrical curved polyhedral impact protection structure. After the above steps, the overall height of the protection structure is finally determined to be h.

[0028] The protective unit 10 can be made of any solid material, such as metal materials like steel, aluminum alloy, titanium alloy, magnesium alloy, tungsten alloy, nickel-based alloy, and high-entropy alloy, as well as polymer materials like ultra-high molecular weight polyethylene, polycarbonate, polyurethane, thermoplastic polyurethane, epoxy resin, silicone rubber, and nitrile rubber, to meet the mechanical performance requirements of different protective environments.

[0029] This application embodiment also obtained a quasi-static comparison of the force-displacement curves of the protective structure and the hexagonal prism buckling energy-absorbing structure in related technologies. For example... Figure 2 As shown, under the condition that the two structures have the same mass, it can be observed that both exhibit similar plateau forces, indicating that the protective structure of this embodiment has a high energy absorption capacity, similar to the hexagonal prism buckling energy absorption structure in the related art. However, compared with the hexagonal prism buckling energy absorption structure in the related art, the protective structure of this embodiment changes more gently in the plateau segment and does not show obvious force peaks, thereby effectively achieving the stability of the energy absorption process and significantly reducing the fluctuation of impact load.

[0030] Reference Figure 3 and Figure 4 As shown, in one embodiment, the end faces at both ends of the protective unit 10 in the first direction are provided with reinforcing rings 20. The height of the reinforcing ring 20 is c, the concentric width of the reinforcing ring 20 is w, and the shape of the reinforcing ring 20 is adapted to the shape of the protective unit 10; for example, when the protective unit 10 includes 4 protective surfaces 101, the reinforcing ring 20 is approximately a quadrilateral; the reinforcing ring 20 can enhance the overall impact resistance and stability of the protective structure.

[0031] Meanwhile, in this embodiment, the width of the reinforcing ring 20 is greater than the thickness of the protective surface 101. This ensures that the reinforcing ring 20 transmits the impact force to the protective unit 10.

[0032] In one embodiment, various types of protective structures can be formed by changing the number of sides (i.e., the number of N) of the initial polygon, the form of the boundary function, the rotation angle, and the parameters of the stiffening ring 20, in order to adapt to different protection needs and application scenarios.

[0033] For example, such as Figure 4 As shown, the protective unit 10 of the protective structure has four protective surfaces 101, and the bottom edge of the protective surface 101 is a straight edge.

[0034] For example, such as Figure 5 As shown, the protective unit 10 of the protective structure has four protective surfaces 101, and the bottom edge of the protective surface 101 is curved.

[0035] For example, such as Figure 6 As shown, the protective unit 10 of the protective structure has five protective surfaces 101, and the bottom edge of the protective surface 101 is curved.

[0036] For example, such as Figure 7 As shown, the protective unit 10 of the protective structure has six protective surfaces 101, and the bottom edge of the protective surface 101 is curved.

[0037] For example, such as Figure 8 As shown, the protective unit 10 of the protective structure has six protective surfaces 101, and the bottom edge of the protective surface 101 is a straight edge.

[0038] For example, such as Figure 9 As shown, the protective unit 10 of the protective structure has eight protective surfaces 101, and the bottom edge of the protective surface 101 is curved.

[0039] Reference Figure 10 As shown, in one embodiment, at least one protective surface 101 of the protective unit 10 has an opening 30.

[0040] Specifically, the opening 30 can be located in the central region of the protective surface 101, and the shape of the opening 30 can be circular, elliptical, or polygonal. Different mechanical properties can be controlled by opening the opening 30 on the protective surface 101.

[0041] Based on the same inventive concept, this application also discloses an energy-absorbing structure, including any of the mirror-shaped curved polyhedral impact protection structures described above in the embodiments of this application.

[0042] Specifically, multiple protective structures can be combined and integrated through periodic, gradient, or random arrangement to form an integrated impact protection layer or protective component, thereby further improving the impact resistance and applicability of the structure.

[0043] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0044] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0045] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A mirror-shaped curved polyhedral impact protection structure, characterized in that, include: Two protective units are stacked along the first direction; The protective unit includes N protective surfaces with thickness, the N protective surfaces are connected in pairs, and the protective surfaces are configured as a continuous curved surface formed by moving and rotating the bottom edge in the first direction; Wherein, N is greater than or equal to 3, and the two protective units include a first unit and a second unit, wherein the first unit and the second unit are arranged in a mirror-symmetric manner about the intermediate connecting surface.

2. The mirror-shaped curved surface polyhedral impact protection structure according to claim 1, characterized in that: The bottom edge can be a straight edge or a curved edge.

3. The mirror-shaped curved surface polyhedral impact protection structure according to claim 1, characterized in that: The protective unit is provided with reinforcing rings on both ends of the first direction, and the shape of the reinforcing rings is adapted to the shape of the protective unit.

4. The mirror-shaped curved surface polyhedral impact protection structure according to claim 3, characterized in that: The width of the reinforcing ring is greater than the thickness of the protective surface.

5. The mirror-shaped curved surface polyhedral impact protection structure according to claim 1, characterized in that: An opening is provided on at least one protective surface of the protective unit.

6. The mirror-shaped curved surface polyhedral impact protection structure according to claim 5, characterized in that: The opening is located in the central region of the protective surface.

7. The mirror-shaped curved surface polyhedral impact protection structure according to claim 5, characterized in that: The shape of the opening includes circular, elliptical, and polygonal.

8. The mirror-shaped curved surface polyhedral impact protection structure according to claim 1, characterized in that: The protective unit is made of either metallic or polymeric materials.

9. An energy-absorbing structure, characterized in that, It includes multiple mirror-shaped polyhedral impact protection structures as described in any one of claims 1-8.

10. The energy-absorbing structure according to claim 9, characterized in that: The protective structures are distributed periodically. Alternatively, the multiple protective structures may be distributed in a gradient manner; Alternatively, the multiple protective structures may be distributed in a disordered manner.

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