Three-dimensional impact-resisting material with negative poisson ratio characteristic

A specific characteristic and negative Poisson technology, applied in the field of material science, can solve problems such as crushing and deformation, and achieve the effect of improving impact toughness and compression resistance

Inactive Publication Date: 2019-06-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

Although the concave negative Poisson's ratio honeycomb described in this paper is prepared through the above steps, because the middle part of the opposite long side of the cell is bent towards e...

Method used

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  • Three-dimensional impact-resisting material with negative poisson ratio characteristic
  • Three-dimensional impact-resisting material with negative poisson ratio characteristic
  • Three-dimensional impact-resisting material with negative poisson ratio characteristic

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings, but it is not used to limit the scope of the present invention.

[0031] Such as figure 1 As shown, the present invention provides a three-dimensional impact-resistant material with negative Poisson's ratio characteristics, which is formed by connecting adjacent cell bodies through arc rib structures 2 and straight rib structures 1 . When the material is stretched in the Z direction, it expands in the X direction and the Y direction; when it is compressed in the Z direction, it shrinks in the X direction and the Y direction. The arc rib structure 2 in a single cell body of the material is composed of three sections of arc ribs with alternating convex and concave and equal diameters, which are tangentially and smoothly connected, so when the Z direction is stretched or compressed, the arc rib structure 2 in the cell body does not produce stress concentrations. ...

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Abstract

The invention discloses a three-dimensional impact-resisting material with a negative poisson ratio characteristic. The material is formed by periodically arranging single cell bodies in the three-dimensional space, wherein each single cell body is formed by connecting a pair of special-shaped quadratic element structures in a mutually orthogonal manner. The single cell bodies are tightly connected with the adjacent cell bodies in the Z direction in a mutually aligned manner through straight rib structures and tightly connected with the adjacent cell bodies through arc rib structures in a mutually parallel and aligned manner. The three-dimensional impact-resisting material with the negative poisson ratio characteristic expands in the X direction and the Y direction when being stretched inthe Z direction and contracts in the X direction and the Y direction when being compressed in the Z direction. The three-dimensional impact-resisting material with the negative poisson ratio characteristic can serve as a buffering material to be applied to structures such as automobile bodies and buffers, and the impact roughness and the anti-pressure capability are greatly improved.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to a three-dimensional impact-resistant material with negative Poisson's ratio characteristics. Background technique [0002] Typically, a material specimen contracts axially when subjected to longitudinal tension and expands axially when the material specimen is compressed. This means that the Poisson's ratio of almost all common material specimens is positive, but there are still some materials with special structures whose Poisson's ratio is negative, for example: the Poisson's ratio of copper foam is -0.8. As early as the end of the 1980s, Professor Lakes prepared foam materials with negative Poisson’s ratio characteristics by thermomechanically treating ordinary foams. Due to their unique characteristics, negative Poisson’s ratio materials have gradually attracted attention and developed rapidly. stand up. [0003] Poisson's ratio (v) is expressed as follows: [000...

Claims

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Application Information

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IPC IPC(8): F16F7/12
Inventor 李凤玲刘源陈昌富李方义荣见华
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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