CN112900324A

CN112900324A - Corrugated energy absorption structure

Info

Publication number: CN112900324A
Application number: CN202110325760.XA
Authority: CN
Inventors: 吴嘉承; 张勇; 林继铭; 康阳阳; 张锋; 刘晓颖
Original assignee: Huaqiao University
Current assignee: Huaqiao University
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-06-04

Abstract

The invention provides a corrugated energy absorption structure which comprises a plurality of energy absorption columns, wherein the energy absorption columns are formed by splicing and enclosing a plurality of corrugated units; the corrugated unit is formed by splicing two corrugated sheets; an angle is formed between the two corrugated sheets, and each corrugated sheet comprises linear edges arranged at the upper side and the lower side; a corrugated curved surface is arranged between the two straight line edges, and the side view of the curved surface is a curve; by applying the technical scheme, the energy absorption structure can have high energy absorption capacity in the collision process.

Description

Corrugated energy absorption structure

Technical Field

The invention relates to the field of energy absorption, in particular to a corrugated energy absorption structure.

Background

In recent years, with the rapid development of the transportation industry, the density of urban networks and logistics networks and the transportation speed are rapidly increasing. This presents a significant challenge to safety issues for personnel and articles, where the protective structure requires sufficient cushioning and energy absorption to achieve safety for the occupants and articles in the face of complex and high speed conditions. However, the current structure often has high buffer capacity and low initial rigidity but is not ideal enough in energy absorption, or can absorb energy captured in collision but has high rigidity to cause large overload at the moment of collision, and the fresh protection structure has the characteristics of being capable of taking both the high buffer capacity and the low initial rigidity.

Disclosure of Invention

The invention aims to provide a corrugated energy absorption structure, which enables the energy absorption structure to have high energy absorption capacity in the collision process.

In order to solve the technical problem, the invention provides a corrugated energy absorption structure which comprises a plurality of energy absorption columns, wherein the energy absorption columns are formed by splicing and enclosing a plurality of corrugated units; the corrugated unit is formed by splicing two corrugated sheets; an angle is formed between the two corrugated sheets, and each corrugated sheet comprises linear edges arranged at the upper side and the lower side; a corrugated curved surface is arranged between the two straight line edges, the side view of the curved surface is a curve, and the curve meets the requirement of

The x direction is parallel to the structural direction of the energy absorption box, and the y direction is perpendicular to the stress direction of the energy absorption box and is parallel to the tangential direction of the curved surface; a is a ripple amplitude coefficient, b is a structural periodicity parameter, and is a parameter for representing the structural periodicity, and the smaller b represents that the ripple quantity generated by the ripple sheet is more.

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

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 cell includes a plurality of rotationally symmetrically disposed cosine panels.

In a preferred embodiment, the cosine panel comprises an upper panel, a lower panel and a plane panel, wherein the upper panel and the lower panel are arranged in parallel, and the plane panel is arranged perpendicular to the upper panel; the two ends of the curved plate are respectively connected with the upper panel and the lower panel; the side view of the curved plate is a cosine curve.

In a preferred embodiment, the cosine curve satisfies:

wherein y is_sAnd x_sTo construct the coordinate system of the curve, c and d are the amplitude and the cycle frequency of the curve, respectively.

In a preferred embodiment, the first composite thin-wall structure layer and the second composite thin-wall structure layer are formed by splicing a plurality of hexagonal units; the hexagonal units are spliced by overlapping the edges of the hexagonal units.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

1. the gradient corrugated structure inspired by paper folding can optimize and promote collision overload and the energy absorption level of the whole structure. By combining the Miura-Ori paper folding method with the sine curve with the ripple characteristic, the structure has more continuity compared with the traditional paper folding method, and combines the advantages of rigid paper folding design and ripple design, thereby improving the energy absorption characteristic of the structure. The gradient design is carried out in the stress direction, so that the structure has lower initial rigidity (low initial collision overload) and simultaneously has more excellent energy absorption level in the crushing process.

2. The structure is high in designability and programmability, and different structure styles can be generated to adapt to different working condition environments. The whole structure of the 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 with different shapes.

3. The laminated board with the sandwich composite structure improves the structure lightweight level and optimizes the structure mechanical property. According to the three-layer design method of the sandwich composite structure, the position of the lattice structure of the middle layer is determined through the honeycomb carving of the upper layer and the lower layer, and the overall lightweight level of the structure is improved under the condition of improving the mechanical property of the structure by utilizing the hollow design of the unique curved surface form of the lattice structure.

Drawings

FIG. 1 is a schematic overall structure view of a corrugated energy absorbing structure according to a preferred embodiment of the present invention;

FIG. 2 is a schematic structural view of an energy absorbing pillar of a corrugated energy absorbing structure in a preferred embodiment of the present invention;

FIG. 3 is a schematic view of a corrugated unit structure of a corrugated energy absorbing structure according to a preferred embodiment of the present invention;

FIG. 4 is a schematic structural view of a corrugated sheet of the corrugated energy absorbing structure according to the preferred embodiment of the present invention;

FIG. 5 is a schematic structural view of a three-dimensional lattice unit of a corrugated energy absorbing structure in a preferred embodiment of the invention;

FIG. 6 is a schematic elevational view of a three-dimensional lattice unit of a corrugated energy absorbing structure in a preferred embodiment of the invention;

FIG. 7 is a schematic top view of a three-dimensional lattice unit of a corrugated energy absorbing structure in a preferred embodiment of the invention;

FIG. 8 is a schematic structural view of a first composite thin-wall structural layer of the corrugated energy absorbing structure according to the preferred embodiment of the invention.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

A corrugated energy absorption structure, refer to figures 1 to 8, and comprises a plurality of energy absorption columns 1, so that the whole energy absorption structure can have sufficient deformation crushing space in the process of crushing after being collided, and each energy absorption column 1 adopts the same height h to ensure that most energy absorption columns 1 can simultaneously generate energy absorption effect in the collision moment. The energy absorption column 1 is formed by splicing and enclosing a plurality of corrugated units 11; the corrugated unit 11 is formed by splicing two corrugated sheets 111; an angle is formed between the two corrugated sheets 111, and the corrugated sheets 111 comprise straight edges arranged at the upper side and the lower side; a corrugated curved surface is arranged between the two straight line edges, the side view of the curved surface is a curve, and the curve meets the requirement of

The x direction is parallel to the structural direction of the energy absorption box, and the y direction is perpendicular to the stress direction of the energy absorption box and is parallel to the tangential direction of the curved surface; a is a ripple amplitude coefficient, b is a structural periodicity parameter, which is a parameter for characterizing the structural periodicity, and a smaller b represents a greater number of ripples generated by the ripple sheet 111. In the present embodiment, the corrugated unit 11 is provided in 4 numbers.

It can be seen from the equation that the amplitude of the structural ripple is mainly determined by x and a, so the amplitude of the ripple of the corrugated sheet 111 increases more and more from the initial point (origin) upwards (positive x direction increases), and a can control the degree of the ripple amplitude, and the larger the value of a, the less the influence of x on the whole structure is, the less the ripple amplitude is, and vice versa. For the energy absorption structure, under the same space (the same interval size of x), the larger the ripple amplitude is, the smaller the force generated by the corrugated sheet 111 at the moment of collision is, the obvious buffering is realized, but the energy absorption is insufficient, and the small ripple amplitude can obviously improve the energy absorption performance and the material utilization rate of the structure, so that different a can obtain different buffering and energy absorption capacities. For another parameter b, which is a structural periodicity parameter, which is a parameter characterizing the structural periodicity, a smaller b represents a greater number of corrugations generated by the corrugated sheet 111. It can be seen that different energy absorption effects can be obtained by selecting two different structural parameters a and b according to different application conditions.

The gradient corrugated structure inspired by paper folding can optimize and promote collision overload and the energy absorption level of the whole structure. By combining the Miura-Ori paper folding method with the sine curve with the ripple characteristic, the structure has more continuity compared with the traditional paper folding method, and combines the advantages of rigid paper folding design and ripple design, thereby improving the energy absorption characteristic of the structure. The gradient design is carried out in the stress direction, so that the structure has lower initial rigidity (low initial collision overload) and simultaneously has more excellent energy absorption level in the crushing process.

The structure is high in designability and programmability, and different structure styles can be generated to adapt to different working condition environments. The whole structure of the 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 with different shapes.

The corrugated sheet 111 is specifically formed by laminating a first composite thin-wall structure layer 21, a three-dimensional lattice structure layer 22 and a second composite thin-wall structure layer 23. The first composite material thin-wall structure layer 21 and the second composite material thin-wall structure layer 23 are formed by splicing a plurality of hexagonal units 211; the hexagonal cells 211 are spliced by overlapping the sides of the hexagonal cells 211.

The three-dimensional lattice structure layer 22 is specifically composed of a plurality of three-dimensional lattice units 220; the three-dimensional lattice cell 220 includes a plurality of rotationally symmetrically arranged cosine panels. The cosine panel comprises an upper panel 221, a lower panel 223 and a plane plate, wherein the upper panel 221 and the lower panel 223 are arranged in parallel, and the plane plate is perpendicular to the upper panel 221; a curved plate 222 having two ends connected to the upper panel 221 and the lower panel 223, respectively; the side view of the curved plate 222 is a cosine curve.

The cosine curve satisfies:

The laminated board with the sandwich composite structure improves the structure lightweight level and optimizes the structure mechanical property. According to the three-layer design method of the sandwich composite structure, the position of the lattice structure of the middle layer is determined through the honeycomb carving of the upper layer and the lower layer, and the overall lightweight level of the structure is improved under the condition of improving the mechanical property of the structure by utilizing the hollow design of the unique curved surface form of the lattice structure.

The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.

Claims

1. A corrugated energy absorption structure is characterized by comprising a plurality of energy absorption columns, wherein the energy absorption columns are formed by splicing and enclosing a plurality of corrugated units; the corrugated unit is formed by splicing two corrugated sheets; an angle is formed between the two corrugated sheets, and each corrugated sheet comprises linear edges arranged at the upper side and the lower side; a corrugated curved surface is arranged between the two straight line edges, the side view of the curved surface is a curve, and the curve meets the requirement of

2. The corrugated energy absorbing structure of claim 1, wherein the corrugated sheet is formed by stacking a first composite thin-wall structure layer, a three-dimensional lattice structure layer and a second composite thin-wall structure layer.

3. The corrugated energy absorbing structure of claim 2, wherein the three-dimensional lattice structure layer is comprised in particular of a plurality of three-dimensional lattice units; the three-dimensional lattice cell includes a plurality of rotationally symmetrically disposed cosine panels.

4. The corrugated energy absorbing structure of claim 3, wherein the cosine panels comprise an upper panel, a lower panel disposed parallel to each other, and a planar panel disposed perpendicular to the upper panel; the two ends of the curved plate are respectively connected with the upper panel and the lower panel; the side view of the curved plate is a cosine curve.

5. The corrugated energy absorbing structure of claim 4, wherein the cosine curve satisfies:

6. The corrugated energy absorbing structure of claim 2, wherein the first composite thin-wall structural layer and the second composite thin-wall structural layer are formed by splicing a plurality of hexagonal units; the hexagonal units are spliced by overlapping the edges of the hexagonal units.