CN-121992892-A - Unfilled corner cube box thin-wall energy absorber for sandwich structure core layer

CN121992892ACN 121992892 ACN121992892 ACN 121992892ACN-121992892-A

Abstract

The invention relates to a unfilled corner cube box thin-wall energy absorber for a sandwich structure core layer, which is of a hollow structure, wherein two corner parts (small cubes) are dug in the body diagonal direction of a large cube to form the unfilled corner cube box thin-wall structure, three top points at the bottom of the structure are contacted with a bottom plate of the sandwich structure, three top points at the top are contacted with a top plate, and a plurality of unfilled corner cube box thin-wall structures, the top plate and the bottom plate jointly form the sandwich anti-impact protection structure.

Inventors

WANG CHENG
XU BIN
YANG TONGHUI
XIAO CHENGLONG
ZHANG RUMING

Assignees

北京理工大学

Dates

Publication Date: 20260508
Application Date: 20260316

Claims (6)

1. The thin-wall energy absorber of the unfilled corner cube box is characterized in that: The energy absorber is of a hollow structure; The energy absorber is formed by hollowing out two small cubes in the direction of the body diagonal of a large cube.
2. The unfilled corner cube box thin-walled energy absorber according to claim 1, wherein: the ratio of the side length of the large cube to the side length of the small cube is 15:8.
3. The unfilled corner cube box thin-walled energy absorber according to claim 1, wherein: the ratio of the wall thickness to the side length of the large cube was 1:30.
4. Use of a thin wall energy absorber of a corner cube corner element in accordance with claim 1, wherein: the energy absorber is used as a core layer of a "sandwich structure.
5. The use of a corner cube corner element thin wall energy absorber according to claim 4 wherein: the energy absorber is arranged between the top plate and the bottom plate; the three vertexes of the bottom of the energy absorber are contacted with the bottom plate; the top three apexes of the energy absorber are in contact with the top plate.
6. The use of a corner cube corner element thin wall energy absorber according to claim 4 wherein: when in use, a plurality of the energy absorbers are arranged between the top plate and the bottom plate in a close-packed array mode.

Description

Unfilled corner cube box thin-wall energy absorber for sandwich structure core layer Technical Field The invention belongs to the technical field of impact resistance protection, and particularly relates to a modularized sandwich structure core layer unit for dynamic load protection, namely a unfilled corner cube box thin-wall energy absorber. Background At present, the sandwich structure is widely applied to the engineering fields of protection, buffering, impact resistance and the like due to light weight, high strength and good energy absorption characteristics. Such structures are typically composed of upper and lower layers of facesheets with an intermediate core layer, the core layer being of a variety of topological forms, such as honeycomb, corrugated, foam, lattice, grid, and negative poisson's ratio structures. However, the existing core structure still has obvious defects under the dynamic load. For example, honeycomb sandwich often has higher initial peak load in the compression process, the peak value can be increased along with the increase of loading rate, excessive instant impact is easy to cause, a metal foam core layer has lower initial peak force and longer crushing stroke, but has limited compressive strength, complex processing technology and higher cost, and a lattice, grid and negative poisson ratio type core layer structure has certain potential in the aspects of energy absorption and deformation modes, but has complex configuration, high manufacturing cost and difficult popularization and application in a large-size structure because the processing depends on a high-precision 3D printing technology. Therefore, as a key component of the sandwich structure, the core layer not only needs to have efficient energy absorbing capability, but also should avoid sharp initial peak loads to achieve smoother impact resistance. On the premise of considering light weight and controllable cost, how to design a new core layer structure with better performance is a technical problem to be solved currently. Disclosure of Invention The invention provides a unfilled corner cube box thin-wall energy absorber for a sandwich-structure core layer. The appearance of the structure is a unfilled corner cube, which is formed by cutting out two corners of the cube in the diagonal direction, and the inside of the structure is hollow. Each unfilled corner cube box thin-wall structure forms an independent unit, and the multi-unit array is matched with the upper panel and the lower panel to form a sandwich structure for impact resistance protection. The technical scheme of the structure provided by the invention is as follows: The thin-wall energy absorber of the unfilled corner cube box is of a hollow structure and is formed by hollowing out two corners in the diagonal direction of a cube. The two angles that dig are square, as "sandwich" structural sandwich layer, the three summit in the bottom of unfilled corner cube box thin wall structure contacts with the bottom plate, and the three summit in top contacts with the roof. The plurality of cells are arranged in a matrix array to form a sandwich structure with the upper apex contacting the upper face sheet and the lower apex contacting the lower face sheet. The beneficial effects of the invention are as follows: The thin-wall energy absorber of the unfilled corner cube box is formed by digging two corners (the shape of each corner is cube) in the direction of the diagonal line of the cube, on one hand, the stability of the thin-wall structure in the crushing process is improved through contact between multiple points and the top plate and the bottom plate, and on the other hand, the annular movable plastic hinge is formed through contact between the vertexes of the plurality of cube faces and the top plate or the bottom plate, so that the energy absorption efficiency is improved, and the problem of sharp initial peak force of the traditional thin-wall energy absorbing structure in the axial crushing process is solved. The unfilled corner cube box thin-wall energy absorber is of a hollow structure, two corners (small cubes) are dug in the direction of a body diagonal of a large cube to form the unfilled corner cube box thin-wall structure, three top points of the bottom of the structure are contacted with a bottom plate of the sandwich structure, three top points of the structure are contacted with a top plate, and a plurality of unfilled corner cube box thin-wall structures, the top plate and the bottom plate jointly form the sandwich anti-impact protection structure; the ratio of the side length of the big cube to the side length of the two small cubes dug out in the direction of the body diagonal is 15:8; The ratio of the wall thickness to the side length of the large cube is 1:30; The plurality of unfilled corner cube box thin-wall structures are arranged in a close-packed array mode and are used as a sandwich-type sandwich shock-resistant protection structure