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Step-by-step elasticoplastic deformation mechanical metamaterial suitable for multiple working 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: 2020-06-26
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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  • Step-by-step elasticoplastic deformation mechanical metamaterial suitable for multiple working conditions
  • Step-by-step elasticoplastic deformation mechanical metamaterial suitable for multiple working conditions
  • Step-by-step elasticoplastic deformation mechanical metamaterial suitable for multiple working conditions

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment uses elastoplastic material (nylon material) to design a mechanical metamaterial with two-step deformation (such as figure 1 Shown), the cells that make up the metamaterial (such as figure 2 (Shown) is composed of 5 rods (vertical rod AO, oblique rod BO, oblique rod CO, support rod BD, and support rod CD) located on the same plane. The length of the five rods is 10mm, two of which are oblique Rod slenderness ratio α 1 Is 0.05, and the angle between the oblique rod BO and the support rod BD is 29°, the slenderness ratio of the vertical rod is α 2 It is 0.1, the slenderness ratio of the support rod is 0.2, and the thickness of the above 5 rods in the direction perpendicular to the plane is 15 mm. In the compression process, firstly the two oblique bars are deformed. Because the strain produced is small, the deformation and buckling mode is elastic deformation, which is recoverable, corresponding to the first stress platform; in the oblique bar compaction Af...

Embodiment 2

[0034] The same conditions are used as in Example 1, except that the slenderness ratio α 1 Changed to 0.03, the force-displacement curve of the obtained metamaterial is as Figure 5 Shown.

Embodiment 3

[0036] The same conditions are used as in Example 1, except that the slenderness ratio α 1 Changed to 0.04, the force-displacement curve of the obtained metamaterial is as Image 6 Shown.

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

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Abstract

The invention relates to a step-by-step elasticoplastic deformation mechanical metamaterial suitable for multiple working conditions. The metamaterial comprises a plurality of cells which are periodically arranged in the same plane, and each cell is composed of a vertical rod, two inclined rods and two supporting rods, wherein the two inclined rods are connected, the connecting point between the inclined rods is connected with one end of the vertical rod, the inclined rods and the supporting rod form a rhombus, the slenderness ratio of the inclined rods is not larger than 0.05, and the included angle between the inclined rods and the supporting rod is not larger than 40 degrees. The metamaterial provided by the invention can be used under various working conditions, and step-by-step elasticoplastic deformation is realized. Under a small impact load, the first stress platform can be used for absorbing energy, and elastic deformation correspondingly occurs, so that the material can be repeatedly utilized; under a large impact load, the second stress platform can participate in the energy absorption process, plastic deformation occurs in the stage, the energy absorption efficiency isimproved, and therefore a better buffering effect is achieved.

Description

Technical field [0001] The invention relates to the technical field of mechanical metamaterials, in particular to a mechanical metamaterial suitable for multi-working conditions of stepwise elastoplastic deformation. Background technique [0002] The design of impact energy absorbing materials has always received attention from the fields of science and engineering. From the landing of the lunar probe, the forced landing of the aircraft, to the collision of cars, etc., energy-absorbing materials are needed to reduce the impact damage of the protected object. [0003] Traditional energy-absorbing materials often only use one of the properties of elasticity or plastic deformation to achieve certain specific functions. For example, the use of elastic deformation to design mechanical metamaterials with recoverable deformation ability, but its energy absorption efficiency is very low, and the use of plastic deformation can achieve higher energy absorption efficiency, but permanent defo...

Claims

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Application Information

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