A corrugated energy-absorbing structure

Abstract

The present invention provides a corrugated energy absorption structure, comprising a plurality of energy absorption columns, wherein the energy absorption columns are formed by splicing a plurality of corrugated units in pairs; the corrugated units are formed by splicing two corrugated sheets; the two corrugated sheets are spaced at an angle, and the corrugated sheets include straight edges arranged on the upper and lower sides; a corrugated curved surface is formed between the two straight edges, and the side view of the curved surface is a curve; the application of this technical solution can achieve a high energy absorption capacity of the energy absorption structure during a collision process.

Description

Technical Field

[0001] The present invention relates to the field of energy absorption, and in particular to a corrugated energy absorption structure. Background Art

[0002] In recent years, with the rapid development of the transportation industry, the density of urban and logistics networks and transportation speeds have increased rapidly. This poses a significant challenge to the safety of people and goods. Faced with complex and high-speed conditions, protective structures require sufficient cushioning and energy absorption performance to protect occupants and objects. However, current structures often have high cushioning capacity and low initial stiffness but are not ideal for energy absorption, or they can absorb energy in a collision but have high stiffness, resulting in large overloads at the moment of collision. Few protective structures can achieve both these characteristics. Summary of the Invention

[0003] The object of the present invention is to provide a corrugated energy absorbing structure, which can achieve high energy absorption capacity during a collision.

[0004] In order to solve the above technical problems, the present invention provides a corrugated energy absorption structure, including a plurality of energy absorption columns, wherein the energy absorption columns are formed by splicing a plurality of corrugated units in pairs; the corrugated units are formed by splicing two corrugated sheets; the two corrugated sheets are spaced at an angle, and the corrugated sheets include straight edges arranged on the upper and lower sides; between the two straight edges is a corrugated curved surface, and the side view of the curved surface is a curve, and the curve satisfies

[0005]

[0006] Among them, the x direction is parallel to the structural direction of the energy absorption box, the y direction is perpendicular to the force direction of the energy absorption box and parallel to the tangential direction of the curved surface; a is the corrugation amplitude coefficient, and b is the structural periodicity parameter, which is a parameter that characterizes the structural periodicity. The smaller b is, the more corrugations are generated by the corrugated sheet.

[0007] In a preferred embodiment, the corrugated sheet is formed by stacking a first composite material thin-wall structure layer, a three-dimensional lattice structure layer, and a second composite material thin-wall structure layer.

[0008] In a preferred embodiment, the three-dimensional lattice structure layer is specifically composed of a plurality of three-dimensional lattice units; the three-dimensional lattice unit includes a plurality of rotationally symmetrically arranged cosine panels.

[0009] In a preferred embodiment, the cosine panel includes an upper panel, a lower panel and a flat panel arranged parallel to each other; and also includes a curved panel with two ends respectively connected to the upper panel and the lower panel; the side view of the curved panel is a cosine curve.

[0010] In a preferred embodiment, the cosine curve satisfies:

[0011]

[0012] where y s and x s is the coordinate system used to construct the curve, c and d are the amplitude and period frequency of the curve respectively.

[0013] In a preferred embodiment, the first composite material thin-walled structural layer and the second composite material thin-walled structural layer are specifically formed by splicing a plurality of hexagonal units; the hexagonal units are spliced ​​together by overlapping the edges of the hexagonal units.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0015] 1. The origami-inspired gradient corrugated structure optimizes collision overloads and the overall energy absorption of the structure. By combining the Miura-Ori origami method with a sinusoidal curve with corrugated characteristics, the structure is made more continuous than traditional origami methods, combining the advantages of rigid origami design with corrugated design, thereby improving the energy absorption characteristics of the structure. A gradient design is performed in the direction of force to ensure that the structure has a lower initial stiffness (low initial collision overload) while having a better energy absorption level during the crushing process.

[0016] 2. The structure is highly designable and programmable, and can produce different structural styles to adapt to different working environments. The overall structure of the present invention adopts a large number of parametric design methods, so that the structure can be better optimized to adapt to different working environments to form structures of different shapes.

[0017] 3. The sandwich composite laminate improves structural lightweighting and optimizes mechanical performance. The three-layer design of the sandwich composite structure uses honeycomb patterns in the upper and lower layers to determine the position of the middle layer's lattice structure. Utilizing the unique curved, hollowed-out design of the lattice structure, it enhances overall structural lightweighting while improving mechanical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the corrugated energy absorption structure in a preferred embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the energy absorbing column structure of the corrugated energy absorbing structure in a preferred embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the corrugated unit structure of the corrugated energy absorption structure in a preferred embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the structure of the corrugated sheet of the corrugated energy absorbing structure in a preferred embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of a three-dimensional lattice unit of a corrugated energy absorption structure in a preferred embodiment of the present invention;

[0023] Figure 6 A schematic front view of a three-dimensional lattice unit of a corrugated energy absorption structure in a preferred embodiment of the present invention;

[0024] Figure 7 A schematic top view of a three-dimensional lattice unit of a corrugated energy absorption structure in a preferred embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the first composite material thin-walled structural layer of the corrugated energy absorption structure in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] A corrugated energy absorbing structure, reference Figures 1 to 8 , including multiple energy-absorbing columns 1, so that the entire energy-absorbing structure can have sufficient deformation and crushing space during the process of being crushed by collision. Each energy-absorbing column 1 adopts the same height h to ensure that most of the energy-absorbing columns 1 can produce energy-absorbing effects at the moment of collision. The energy-absorbing column 1 is formed by a plurality of corrugated units 11 spliced ​​together in pairs; the corrugated unit 11 is formed by splicing two corrugated sheets 111; the two corrugated sheets 111 are spaced at an angle, and the corrugated sheets 111 include straight edges set on the upper and lower sides; between the two straight edges is a corrugated curved surface, and the side view of the curved surface is a curve, and the curve satisfies

[0028]

[0029] The x-direction is parallel to the structural direction of the crash box, the y-direction is perpendicular to the force direction of the crash box and parallel to the tangent direction of the curved surface. a is the corrugation amplitude coefficient, and b is the structural periodicity parameter, which characterizes the structural periodicity. A smaller b indicates a greater number of corrugations generated by the corrugated sheet 111. In this embodiment, four corrugated units 11 are provided.

[0030] It can be seen from the equation that the amplitude of the structural ripples mainly depends on x and a. Therefore, the amplitude of the ripples of the corrugated sheet 111 becomes more intense from the initial point (origin) upward (x increases in the positive direction), and a can control the degree of the ripple amplitude. The larger the value of a, the less the entire structure is affected by x, and the less significant the ripple amplitude is. Conversely. For energy-absorbing structures, in the same space (the interval size of x is the same), the larger the ripple amplitude, the smaller the force generated by the corrugated sheet 111 at the moment of collision, the buffering is obvious, but the energy absorption is insufficient. A small ripple amplitude can significantly improve the energy absorption performance and material utilization of the structure. Therefore, different a can obtain different buffering and energy absorption capabilities. As for another parameter b, it is a structural periodicity parameter, which is a parameter that characterizes the periodicity of the structure. The smaller b is, the more ripples are generated by the corrugated sheet 111. It can be seen that different energy absorption effects can be obtained by selecting different two structural parameters a and b for different application conditions.

[0031] The origami-inspired gradient corrugated structure can optimize the energy absorption level of the collision overload and the overall structure. By combining the Miura-Ori origami method with a sinusoidal curve with corrugated characteristics, the structure is made more continuous than the traditional origami method, combining the advantages of rigid origami design and corrugated design, thereby improving the energy absorption characteristics of the structure. A gradient design is performed in the direction of force to ensure that the structure has a lower initial stiffness (low initial collision overload) and a better energy absorption level during the crushing process.

[0032] The structure is highly designable and programmable, and can produce different structural styles to adapt to different working environments. The overall structure of the present invention adopts a large number of parametric design methods, so that the structure can be better optimized to adapt to different working environments to form structures of different shapes.

[0033] The corrugated sheet 111 is specifically formed by stacking a first composite thin-walled structural layer 21, a three-dimensional lattice structural layer 22, and a second composite thin-walled structural layer 23. The first composite thin-walled structural layer 21 and the second composite thin-walled structural layer 23 are specifically formed by splicing a plurality of hexagonal units 211; the hexagonal units 211 are spliced ​​together by overlapping their edges.

[0034] The three-dimensional lattice structure layer 22 is specifically composed of a plurality of three-dimensional lattice units 220. The three-dimensional lattice units 220 include a plurality of rotationally symmetrical cosine panels. The cosine panels include an upper panel 221 and a lower panel 223 arranged parallel to each other, and a flat panel arranged perpendicular to the upper panel 221. The panels also include a curved panel 222 with two ends connected to the upper panel 221 and the lower panel 223. The side view of the curved panel 222 is a cosine curve.

[0035] The cosine curve satisfies:

[0036]

[0037] where y s and x s is the coordinate system used to construct the curve, c and d are the amplitude and period frequency of the curve respectively.

[0038] Sandwich composite laminates improve structural lightweighting and optimize mechanical properties. The three-layer design of the sandwich composite structure uses honeycomb patterns in the upper and lower layers to determine the position of the middle lattice structure. Leveraging the unique curved, hollowed-out design of the lattice structure, this design enhances overall structural lightweighting while improving mechanical properties.

[0039] The above is only a preferred specific embodiment of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with this technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the scope of protection of the present invention.

Claims

1. A corrugated energy absorption structure, characterized in that The energy absorbing column comprises a plurality of corrugated units connected in pairs; the corrugated unit is formed by connecting two corrugated sheets; the two corrugated sheets are spaced at an angle, and the corrugated sheets include straight edges arranged on the upper and lower sides; a corrugated curved surface is formed between the two straight edges, and the side view of the curved surface is a curve, and the curve satisfies Among them, the x direction is parallel to the structural direction of the crash box, the y direction is perpendicular to the force direction of the crash box and parallel to the tangential direction of the curved surface; a is the corrugation amplitude coefficient, and b is the structural periodicity parameter, which is a parameter that characterizes the structural periodicity. The smaller b is, the more corrugations are generated by the corrugated sheet. The corrugated sheet is specifically formed by stacking a first composite material thin-wall structure layer, a three-dimensional lattice structure layer and a second composite material thin-wall structure layer; The three-dimensional lattice structure layer is specifically composed of a plurality of three-dimensional lattice units; the three-dimensional lattice unit includes a plurality of rotationally symmetrically arranged cosine panels; The cosine panel includes an upper panel and a lower panel arranged parallel to each other, and a flat panel arranged perpendicular to the upper panel; and further includes a curved panel with two ends connected to the upper panel and the lower panel respectively; the side view of the curved panel is a cosine curve; The cosine curve satisfies: where y s and x s is the coordinate system used to construct the curve, c and d are the amplitude and period frequency of the curve respectively; The first composite material thin-walled structural layer and the second composite material thin-walled structural layer are specifically formed by splicing a plurality of hexagonal units; the hexagonal units are spliced ​​together by overlapping the edges of the hexagonal units.

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