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Buffering energy-absorbing structure

A technology of energy-absorbing structure and wall structure, applied in the direction of bumpers, etc., can solve the problems of low energy, inefficient energy absorption of combined structure, waste of materials, etc., achieve stable impact force, stable deformation mode, and reduce casualties Effect

Inactive Publication Date: 2012-10-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the energy absorbed per unit volume of the traditional metal thin-walled energy-absorbing structure is small and the energy of the combined structure cannot be efficiently absorbed and easily cause unnecessary waste of materials. Energy structure and design method, the main idea is to start from the practical engineering point of view of high-efficiency energy absorption capacity and rational utilization of materials, according to the change characteristics of energy absorption in the buffer process, the porous materials such as light metal honeycomb and metal foam are reasonably distributed according to the different strengths In a closed space, a new type of buffer energy-absorbing structure is formed

Method used

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specific Embodiment approach 1

[0017] Specific Embodiment 1: The main external structure of this embodiment is a metal cylindrical hollow thin-walled structure, and the filling material is a foamed aluminum material with functional gradient changes. Due to the difficulty and high cost of manufacturing functionally graded foam materials in the existing technology, Therefore, the filled functionally graded foam material is subdivided into many layers along the length direction, and each layer is a uniform foam material. This technical change can not only enhance the deformation stability and improve the deformation mode of the hollow thin-walled structure, but also can The energy absorption capacity of the hollow thin-walled structure is improved, and at the same time, the collision force changes smoothly during the entire collision process, which can greatly improve the safety of the occupants.

[0018] For each layer of uniform foam, the stress-strain relationship can be described by the isotropic constituti...

specific Embodiment approach 2

[0033] Specific implementation mode two: (see image 3 ) The external structure of this embodiment includes a metal cap-shaped thin-walled structure, image 3 As the cross section of the structure, it consists of a U-shaped structure 12 and a web 13 which are fixedly connected by a welding structure 14 to form a closed cavity. Other implementation processes are the same as the specific implementation mode 1, along the image 3 The structure of the cross-section B-B in the figure 2 The structure in is similar.

specific Embodiment approach 3

[0034] Embodiment 3: The main difference between this embodiment and Embodiment 1 is that the internal structure is a honeycomb structure, and the sandwich layer of this structure is a series of hexagonal cells made of metal materials. The upper and lower sides of the sandwich layer are then glued (or brazed) to a thinner surface plate. The honeycomb structure has higher strength and rigidity than other sandwich structures, and compared with the riveted structure, the structural efficiency can be increased by 15% to 30%. The size and height of the honeycomb cells in the interlayer and the thickness of the thin slices that make up the lattice determine the critical stress of the local buckling of the surface plate and the buckling of the cell wall plate. Metal honeycomb structure materials have a wide range of sources and low cost. The combined structure is conducive to absorbing impact energy in stages, and can improve the energy absorption capacity of the hollow thin-walled s...

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Abstract

The invention discloses a buffering energy-absorbing structure which comprises a hollow metal thin-wall structure, wherein a light metal foam material or metal cellular material is filled in the hollow metal thin-wall structure; the hollow metal thin-wall structure is fixedly connected with the filled light metal cellular material through binding or brazing, thereby forming the complete buffering energy-absorbing structure; the density of the filled metal foam material along the longitudinal direction is changed in a gradient form; and an aperture size or cellular wall thickness of the filled metal cellular material along the longitudinal direction is changed in the gradient form. Compared with the traditional energy-absorbing structure, the buffering energy-absorbing structure has the advantages that the deformation mode is more stable, the energy-absorbing efficiency is higher, the weight of the energy-absorbing structure is effectively reduced, the impact force during the whole energy-absorbing process is stable and the crashing safety of the energy-absorbing structure is greatly increased. The buffering energy-absorbing structure served as a direct impact energy-absorbing structure of an automobile can greatly increase the direct impact safety of the automobile and can reduce the casualties.

Description

technical field [0001] The invention relates to an energy-absorbing structure, in particular to a cushioning energy-absorbing structure in which the performance of the filling material changes according to the functional gradient along the longitudinal direction. Background technique [0002] "Safety, energy saving, and environmental protection" are the three major themes in the development of contemporary automobiles, and the safety issue, that is, the crashworthiness issue, ranks first. Energy saving and environmental protection require the structure to have the characteristics of light weight and high energy absorption. Any increase in mass means more fuel consumed and more pollution to the environment. With the increasingly serious problem of automobile lightweight, how to reasonably design a good buffer energy-absorbing structure to meet the crashworthiness requirements of automobiles has become a direction of energy-absorbing structure design. [0003] Metal lightwei...

Claims

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Application Information

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IPC IPC(8): B60R19/22
Inventor 孙光永李光耀徐峰祥方剑光
Owner HUNAN UNIV
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