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Chiral auxetic metamaterial structure with tension-torsion coupling characteristics and preparation method thereof

A material structure and chirality technology, applied in 3D object support structure, additive manufacturing, mechanical equipment, etc., can solve the problems of tension-torsion coupling behavior, energy absorption capacity restriction, inclined rod shedding structure, complicated preparation process, etc. The effect of removing the assembly link, improving auxetic and torsional performance, and simplifying the manufacturing process

Active Publication Date: 2020-12-08
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional preparation method, each part is obtained separately by using metal or polymer resin, and the inclined rod is fixed with the chiral structure by laser welding or assembly, but there are problems such as complicated preparation process, poor connection effect, and low positioning accuracy, which are of great importance to The mechanical properties will have a great impact, which is manifested by the shedding of the inclined rod and the premature failure of the structure during the loading process, which seriously restricts its tension-torsion coupling behavior and energy absorption capacity.

Method used

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  • Chiral auxetic metamaterial structure with tension-torsion coupling characteristics and preparation method thereof
  • Chiral auxetic metamaterial structure with tension-torsion coupling characteristics and preparation method thereof
  • Chiral auxetic metamaterial structure with tension-torsion coupling characteristics and preparation method thereof

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preparation example Construction

[0054] A method for preparing a chiral auxetic metamaterial structure with tension-torsion coupling characteristics of the present invention comprises the following steps:

[0055] S1. Select a polygonal ring structure as the unit cell shape. The corresponding number of connecting rods and rings are connected at an acute angle at the vertices of the polygon. The upper and lower polygonal rings with connecting rods are in a reverse relationship with each other and the centroids are aligned in the Z direction. Corresponding A number of inclined cylinders connect the vertices of the upper and lower rings in pairs to form an inclined rotation direction, and then distribute the unit cells in an array in space to obtain the model;

[0056] S2, utilize Solidworks software to carry out geometric modeling and configuration design to the model that step S1 obtains;

[0057] Establish a three-dimensional unit cell structure, including the side length and width of the polygonal ring struc...

Embodiment 1

[0062] see figure 1 and figure 2 , a chiral auxetic metamaterial structure with tension-torsion coupling properties obtained from a three-dimensional unit cell structure consisting of two regular hexagonal rings with connecting rods and an inclined cylinder between the rings through a spatial array , the connecting rod and the ring are connected at an acute angle at the vertices of the regular hexagon and are distributed in a circular array centered on the centroid of the ring. Two inclined cylinders connect the vertices of the upper and lower rings in pairs, and the axis of each cylinder is not parallel to the centroid line of the upper and lower rings, and is arranged in a circle with the centroid line as the center line, forming an inclined rotation direction. The unit cells are distributed in space in the X direction, the 120° direction from X, and the Z direction. On the XOY plane, the connecting rod intersections of adjacent units are connected in a cylindrical manner,...

Embodiment 2

[0070] see figure 1 and figure 2 , a chiral auxetic metamaterial structure with tension-torsion 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 and inclined cylinders is changed to 4, and the connecting rods and The rings are connected at the vertices of the square at an acute angle and are distributed in a circular array centered on the centroid of the rings. The upper and lower rings with connecting rods are in a reverse relationship with each other and the centroids are aligned in the Z direction. Four inclined cylinders connect the upper and lower rings. The vertices of the cylinders are connected in pairs, and the axes of the cylinders are not parallel to the line connecting the centroids of the upper and lower rings, and are arranged in a circle with the line connecting the centroids as the center line, forming an oblique direction of rotation. The unit c...

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Abstract

The invention discloses a chiral auxetic metamaterial structure with tension-torsion coupling characteristics and a preparation method thereof. The chiral auxetic metamaterial structure comprises a plurality of three-dimensional unit cell structures, each three-dimensional unit cell structure comprises two polygonal annular structures arranged up and down, and the vertexes of the upper and lower polygonal annular structures are connected through correspondingly-arranged inclined cylinders; a plurality of inclined cylinders are arranged in a staggered mode in the same direction, connecting rodsused for being connected with the adjacent three-dimensional unit cell structures are arranged at the vertexes of the two polygonal annular structures respectively, the plurality of three-dimensionalunit cell structures are arranged in a spatial array mode, and the chiral auxetic metamaterial structure with the tension-torsion coupling characteristics is formed by connecting the corresponding connecting rods.

Description

technical field [0001] The invention belongs to the technical field of porous material structures, and in particular relates to a chiral auxetic metamaterial structure with tension-torsion coupling characteristics and a preparation method thereof. Background technique [0002] Tension-torsion metamaterials are artificially designed material structures that have emerged with the rapid development of structural mechanics in recent years, and have the characteristic of torsional deformation response under unidirectional tension / compression loading. Its main body is composed of chiral structures through periodic arrangement. When it is under load, it will not expand around like conventional materials, but will undergo overall torsion due to the transmission of force by the chiral structure. In addition, this type of metamaterial also has auxetic properties, that is, when it is stretched / compressed in one direction, there will be expansion / contraction deformation perpendicular to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F7/12B22F3/105B29C64/118B29C64/386B33Y10/00B33Y50/00
CPCF16F7/124B29C64/118B29C64/386B33Y10/00B33Y50/00Y02P10/25
Inventor 韩宾吴昊张琦
Owner XI AN JIAOTONG UNIV
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