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Chiral auxetic metamaterial structure with compression-shear coupling properties and its preparation method

A technology of material structure and chirality, which is applied in processing and manufacturing, additive processing, mechanical equipment, etc., can solve the problems of low structural precision, few applicable materials, and large unit cell scale, so as to improve the overall auxetic and compressive shear performance , excellent load-bearing and auxetic properties, and the effect of reducing stress concentration

Active Publication Date: 2022-02-01
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For compression-shear metamaterials, the traditional preparation method adopts investment casting method, but this method has cumbersome process flow, large unit cell scale, low structural accuracy, and few applicable materials, which is difficult to meet the needs of practical applications.

Method used

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  • Chiral auxetic metamaterial structure with compression-shear coupling properties and its preparation method
  • Chiral auxetic metamaterial structure with compression-shear coupling properties and its preparation method
  • Chiral auxetic metamaterial structure with compression-shear coupling properties and its preparation method

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preparation example Construction

[0050] A method for preparing a chiral auxetic metamaterial structure with compression-shear coupling characteristics of the present invention comprises the following steps:

[0051] S1. Select a polygonal ring structure as the unit cell shape, and connect the corresponding number of connecting rods with the polygonal ring structure at the vertices of the polygonal ring structure at an acute angle, and then arrange the two-dimensional unit cell structure in an array on the plane and mutually Connect to obtain a planar model, and due to preparation requirements, stretch the planar model in the vertical direction to obtain a prepared model;

[0052] S2. Using Solidworks software to carry out geometric modeling and configuration design of the model;

[0053] First establish a two-dimensional unit cell structure, including the side length and width of the polygonal ring structure, the length and width of the connecting rod, the connection angle between the connecting rod and the p...

Embodiment 1

[0057] see figure 1 and figure 2 , a chiral auxetic metamaterial with compression-shear coupling properties, obtained from a two-dimensional unit cell structure through a planar array, the unit cell is composed of regular hexagonal rings with connecting rods, and the connecting rods and rings are in the The vertices are connected at an acute angle and are distributed in a circular array centered on the centroid of the ring; the unit cells are arranged in an array in the X direction and a direction 120° from X on the plane. On the XOY plane, the connecting rods of adjacent units intersect with connected in a circular fashion.

[0058] A method for preparing a chiral auxetic metamaterial with compression-shear coupling characteristics, the specific steps are as follows:

[0059] Step 1: Select a regular hexagonal ring as the shape of the unit cell, and connect the six connecting rods and the ring at the vertices of the regular hexagon at an acute angle, and then distribute th...

Embodiment 2

[0064] see figure 1 and figure 2 , a chiral auxetic metamaterial with compression-shear coupling characteristics, referring to Example 1, the difference is that the regular hexagonal ring can be replaced by a square ring, the number of connecting rods becomes 4, and the connecting rods and rings are in a square The vertices are connected at an acute angle and distributed in a circular array centered on the centroid of the ring. The unit cells are arranged in an array in the X direction and the Y direction on the plane. On the XOY plane, the connecting rod intersections of adjacent units are connected in a circular manner.

[0065] A method for preparing a chiral auxetic metamaterial with compression-shear coupling characteristics, the specific steps are as follows:

[0066] Referring to step 2 in Example 1, the difference is that the side length and width of the square ring are 10.36mm and 2mm respectively, the length and width of the connecting rod are 10.32mm and 1.5mm re...

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Abstract

The invention discloses a chiral auxetic superstructural material structure with compression-shear coupling characteristics and a preparation method thereof. Polygonal chiral structures of different shapes are periodically arranged and connected to each other, so that it has excellent compression-shear coupling characteristics and The auxetic characteristics, and the connecting rods are connected in a circular manner, and the negative Poisson's ratio behavior is generated through two deformation mechanisms of concave and rotation when bearing the load, thus forming a strong energy absorption and impact resistance characteristic; the simulation results show that the The structure has remarkable compression-shear coupling and auxetic properties, and has broad prospects in industrial applications.

Description

technical field [0001] The invention belongs to the technical field of negative Poisson's ratio material structures, and in particular relates to a chiral auxetic metamaterial structure with compression-shear coupling characteristics and a preparation method thereof. Background technique [0002] Compression-shear metamaterials are one of the negative Poisson’s ratio materials, which have a compression-shear coupling effect, that is, normal stress will cause shear strain, and shear stress will cause positive strain. This coupling effect becomes the basis for the design of three-dimensional tension-torsion coupling materials. . Its main body is composed of multi-ligament chiral honeycomb structure. When under load, it produces negative Poisson's ratio behavior through two deformation mechanisms of concave and rotation, thus forming a strong energy absorption and impact resistance property, which can be used as structural protection material and sandwich filling It has broad ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/10B29C64/386B29C64/393B33Y50/00B33Y50/02
CPCF16F7/124B29C64/10B29C64/386B29C64/393B33Y50/00B33Y50/02
Inventor 韩宾吴昊张琦
Owner XI AN JIAOTONG UNIV
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