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A Mechanics Metamaterial for Step-by-Step Elastic-Plastic Deformation Applicable to Multiple Operating Conditions

An elastic-plastic deformation and metamaterial technology, applied in the field of mechanical metamaterials, can solve the problems of low energy absorption efficiency, cannot be reused, and has not yet been designed, and achieves increased energy absorption efficiency, programmability, and good buffering effect. Effect

Active Publication Date: 2022-08-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, elastic deformation is used to design mechanical metamaterials with recoverable deformation ability, but its energy absorption efficiency is very low, while plastic deformation can achieve high energy absorption efficiency, but it is permanently deformed and cannot be reused, so it has not yet been designed. Mechanical metamaterials that can undergo elastic deformation and plastic deformation respectively

Method used

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  • A Mechanics Metamaterial for Step-by-Step Elastic-Plastic Deformation Applicable to Multiple Operating Conditions
  • A Mechanics Metamaterial for Step-by-Step Elastic-Plastic Deformation Applicable to Multiple Operating Conditions
  • A Mechanics Metamaterial for Step-by-Step Elastic-Plastic Deformation Applicable to Multiple Operating Conditions

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In this example, an elastic-plastic material (nylon material) is used to design a mechanical metamaterial with two-step deformation (such as figure 1 shown), the cells that constitute the metamaterial (such as figure 2 shown) is composed of 5 rods located on the same plane (vertical rod AO, inclined rod BO, inclined rod CO, support rod BD and support rod CD), the length of the five rods is 10mm, two of which are inclined The slenderness ratio α of the rod 1 is 0.05, and the angle between the inclined rod BO and the support rod BD is 29°, and the slenderness ratio of the vertical rod is α 2 is 0.1, the slenderness ratio of the support rod is 0.2, and the thicknesses of the above-mentioned five rods in the direction perpendicular to the plane are all 15 mm. During the compression process, the first two oblique rods are deformed. Due to the small strain generated, their deformation and buckling modes are elastic deformation, which are recoverable and correspond to the f...

Embodiment 2

[0034] The same conditions are used as in Example 1, the difference is only that the slenderness ratio α of the inclined rod in Example 1 is changed. 1 Changed to 0.03, the force-displacement curve of the obtained metamaterial is as follows Figure 5 shown.

Embodiment 3

[0036] The same conditions are used as in Example 1, the difference is only that the slenderness ratio α of the inclined rod in Example 1 is changed. 1 Changed to 0.04, the force-displacement curve of the obtained metamaterial is as follows Image 6 shown.

[0037] It can be seen from Examples 2 and 3 that the height of the double platform can be adjusted by changing the geometric parameter of the slenderness ratio of the inclined rod, so as to adapt to different loading conditions.

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Abstract

The present invention involves a mechanical super material for step -by -step transformation that is applicable to multi -working conditions, including multiple meta cells arranged in the same plane;The composition of the roots support rod, the two -described diagonal rod is connected, the connection point between the diagonal rod is connected to the one end of the vertical rod, which is a diamond shape with the supporting rod.The length ratio is not greater than 0.05, and the angle of the slashing rod and the support rod is not greater than 40 °.The super material provided by the present invention can be used to use and step -by -step plastic deformation in a variety of working conditions.Under a small impact load, energy absorption can be used to use its first stress platform, corresponding to elastic deformation, so that the material can be reused; under a large impact load, the second stress platform can participate in the energy absorption process.In this stage, plastic deformation occurs at this stage, increasing energy absorption efficiency, thereby playing a better buffer effect.

Description

technical field [0001] The invention relates to the technical field of mechanical metamaterials, in particular to a mechanical metamaterial suitable for step-by-step elastic-plastic deformation in multiple working conditions. Background technique [0002] The design of impact energy absorbing materials has always received attention in the fields of science and engineering. From the landing of a lunar rover, the forced landing of an airplane, to the collision of a car, etc., energy-absorbing materials are required to reduce the impact damage of the protected object. [0003] Traditional energy-absorbing materials often only use one of the properties of elastic or plastic deformation to achieve some specific functions. For example, using elastic deformation to design mechanical metamaterials with recoverable deformation ability, but its energy absorption efficiency is very low, while using plastic deformation can achieve high energy absorption efficiency, but it is permanentl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16C60/00
CPCG16C60/00F16F7/00
Inventor 陈常青孟志强
Owner TSINGHUA UNIV
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