8-shaped folded paper buffering and energy absorbing structure

Abstract

The invention belongs to the technical field of anti-impact protection, relates to a core layer structure applied to a'sandwich 'laminated composite structure, and provides an' 8 '-shaped origami buffering and energy-absorbing structure which is a origami structure comprising m rings formed by rotationally connecting strip-shaped thin plates in an' 8 'shape, the structure is composed of a plurality of triangular surfaces, parallelogram surfaces and trapezoidal surfaces, and the triangular surfaces, the parallelogram surfaces and the trapezoidal surfaces are arranged in a geometric topology array to form a core layer; compared with a traditional corrugated board structure, the structure has the lower initial peak crushing load and the higher average crushing load, the energy absorption performance can be remarkably improved, and the structure is an efficient anti-impact energy absorption structure; the structure can be widely applied to the fields of anti-explosion and anti-impact protection of individual soldier protection equipment and armored vehicles and anti-impact protection of shells of missiles and aircrafts.

Description

Technical Field

[0001] This invention belongs to the field of dual-use protective technology, specifically relating to a figure-eight folded paper buffer energy-absorbing structure. This thin-walled energy-absorbing structure, as the core layer of a "sandwich" composite structure, is suitable for impact protection in individual body armor, helmets, and other applications, as well as shock-wave protective armor for combat vehicles, missile impact-resistant shells, and packaging engineering. Background Technology

[0002] Corrugated board, as a typical "sandwich" composite board, is a classic impact-resistant protective structure with excellent drop-resistant cushioning and energy absorption properties. Its processing is simple and inexpensive, and it is currently widely used in the packaging engineering field.

[0003] Corrugated sheets form a "sandwich" structure by sandwiching a core layer between two panels, providing sufficient deformation stroke for impact and dissipating impact energy through the plastic deformation of the core and panels, thereby achieving effective protection for the protected structure.

[0004] Existing corrugated board core layers typically employ triangular corrugated, sinusoidal, or trapezoidal corrugated structures. However, these structures have the following drawbacks:

[0005] 1) There is a significant peak load in the initial stage of crushing, which can easily cause a large instantaneous deceleration to the protected object, thus causing damage;

[0006] 2) The core layer only forms fixed plastic hinges, with a single deformation mode and limited energy absorption capacity;

[0007] 3) It is difficult to meet the high-efficiency protection requirements under strong impact loads.

[0008] Currently, there is an urgent need to develop novel impact-resistant protective structures in fields such as individual body armor and helmet impact protection, armored vehicle chassis blast wave protection, and aircraft shell impact resistance, to achieve comprehensive performance optimization through lightweight design, high energy absorption efficiency, and low cost. Therefore, it is necessary to build upon the design principles of corrugated sheets and introduce novel core layer structures to improve the core layer's ability to absorb impact energy and reduce the initial peak load under limited space and mass constraints, thereby meeting the demands of multiple fields for high-performance impact-resistant energy-absorbing structures. Summary of the Invention

[0009] (a) Purpose of the invention

[0010] This invention proposes an "8"-shaped origami buffer energy absorption structure, which abandons the traditional sinusoidal, triangular and trapezoidal core layer structures and adopts an "8"-shaped origami buffer energy absorption structure as the core layer to achieve a significant reduction in peak load during the initial crushing stage and a substantial improvement in energy absorption capacity.

[0011] (II) Technical Solution

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] An "8"-shaped origami cushioning and energy-absorbing structure includes a top plate (2), a bottom plate (3), a core layer (1), and a filling layer (4), as shown in the attached figure. Figure 3 As shown. Wherein: the core layer (1) is a double-ring structure formed by connecting strip structures through a figure-eight rotation, as shown in the attached diagram. Figure 1 As shown; for longer strip structures, multiple figure-eight shaped loops can be used to form a series multi-ring structure (similar to a "candied hawthorn" string structure); the above double-ring structure or series multi-ring structure is arranged in a two-dimensional topological array to form the core layer (1). The ratio of the wall thickness to the feature size of the strip structure is 1:0.01 to 1:0.2.

[0014] In terms of materials: the core layer (1) is preferably made of 6-series aluminum alloy, 316L stainless steel or Nylon 12 CF material, but not limited to ductile aluminum alloy, low carbon steel and other metal materials, as well as non-metallic materials such as polymer, thermoplastic material, nylon and carbon fiber composite material; the top plate (2) and bottom plate (3) are preferably made of ultra-high molecular weight polyethylene plate, carbon fiber plate or aluminum plate and other materials.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By connecting two or more basic ring structures in series to form an "8" shaped or multi-ring series structure, and arranging them in two dimensions to form the core layer, performance can be improved without significantly increasing structural complexity and mass.

[0018] It significantly reduces the peak load at the initial stage of crushing, decreases the instantaneous impact acceleration, and improves the safety of the protected object;

[0019] Improve the overall energy absorption capacity of the structure, make the load-displacement curve during the crushing process smoother and more stable, and form a higher and more stable platform load;

[0020] It has a simple structure, is easy to manufacture and replace, and has good prospects for engineering applications;

[0021] When used in individual body armor and helmets, it can effectively improve the dissipation and absorption of blunt impact energy, reduce the peak acceleration caused by impact, and enhance the protection of the human chest, abdomen and head.

[0022] In the protection of unmanned combat vehicles, armored vehicle chassis against explosive impacts, and missile and aircraft shells, lightweight structures and highly efficient impact protection can be achieved. Attached Figure Description

[0023] Figure 1 Three-view diagram and three-dimensional schematic diagram of a double-ring figure-eight origami buffer energy-absorbing thin-walled structure;

[0024] Figure 2 A folding method for a double-ring figure-eight origami structure;

[0025] Figure 3 Schematic diagrams of the figure-eight origami structure under different parameters: the first number of loops m=3; the second number of loops m=4;

[0026] Figure 4 This is a schematic diagram of a "sandwich" sandwich structure for impact-resistant buffering and energy absorption, which is composed of a double-ring "8"-shaped origami buffering and energy-absorbing thin-walled structure array. Detailed Implementation

[0027] The present invention relates to an “8” shaped origami buffer energy absorption structure, which serves as the core layer (1) and together with the top plate (2), the bottom plate (3) and the porous filling material (4) disposed inside the “8” shaped origami structure, constitutes a composite energy absorption structure.

[0028] In practical applications, polyurethane foam or aluminum foam (4) can be filled inside the figure-eight origami buffer energy-absorbing structure (1) or the beaded figure-eight origami structure array formed in series. The top and bottom ends of the structure are connected and fixed to the top plate (2) and the bottom plate (3) respectively by hot melt adhesive.

[0029] Among them, the top plate (2) is the impact-facing surface and the bottom plate (3) is the impact-reducing surface. The core layer, which is composed of an array of figure-eight origami structures, is combined with the top plate (2) and the bottom plate (3) to form an energy-absorbing box structure, which can effectively absorb impact kinetic energy.

[0030] In individual soldier protection applications, this structure can use a ballistic fiber woven layer as the base plate (3) and a core layer (1) made of non-metallic or thin metal materials, thus forming a comprehensive protective structure with both penetration resistance and blunt impact resistance when combined with the ballistic fiber. When a projectile strikes the ballistic fiber layer, the structure undergoes blunt impact deformation, and the impact energy is sequentially transferred to the top plate (2), core layer (1), and base plate (3). All three undergo large deformation and absorb the impact energy, thereby significantly reducing the damage to the human body caused by the projectile's kinetic energy and shock wave.

[0031] In the application of blast shock wave protection for unmanned combat vehicles and armored vehicle chassis, the structure described in this invention can be arranged as a protective layer on the surface of the protected structure. The structure consists of a top plate (2), an array of core layers (1), a bottom plate (3), and a porous filling material (4). Depending on the impact load strength and the requirements for structural lightweighting, the top plate (2) and the bottom plate (3) can be made of materials such as aluminum alloy, steel, or high-density polyethylene, while the core layer (1) can be made of metallic or non-metallic materials with high strain rate performance and high tangential modulus.

[0032] Under the impact of the explosion, the top plate (2) as the blast-facing surface first bears the shock wave load. Then the top plate (2), core layer (1) and bottom plate (3) undergo synergistic plastic deformation and dissipate the impact energy. The remaining energy is transferred to the protected structure through the bottom plate (3), thereby achieving effective impact protection.

Claims

1. An "8"-shaped origami buffer energy-absorbing structure, characterized in that, It includes a top plate (2), a bottom plate (3), a core layer (1) and a filling layer (4); wherein, the core layer (1) is formed by connecting strip structures in a figure-eight rotation manner to form a double ring structure, or by connecting strip structures in a series of figure-eight rotation manner to form a series multi-ring structure; the series multi-ring structure is arranged in a two-dimensional topological array manner to constitute the core layer (1).

2. The figure-eight shaped origami buffer energy-absorbing structure according to claim 1, characterized in that: The strip structure is used to form an "8"-shaped rotating structure with m rings, where m ≥ 2, and the end face of the first ring at the starting end is a regular n-sided polygon, where n = 3, 4, or 5; the strip structure is divided by edges to form 2nm−4m+6 faces, of which except for one isosceles trapezoidal face and 2m−3 parallelogram faces, the rest are isosceles triangular faces; the base length of the isosceles triangular face is a, the leg length is c, then the upper base length of the isosceles trapezoidal face is b = a / [2cos(180° / n)], and the lower base length is a+b; the upper and lower sides of the parallelogram are a+b, and the left and right hypotenuses are c.

3. The figure-eight folding buffer energy-absorbing structure according to claim 1, characterized in that: The ratio of the characteristic side length a to the wall thickness of the strip structure is 1:(0.01~0.2); the structural material is a metal or non-metal material with good plasticity, preferably 6 series aluminum alloy or 316L stainless steel.

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