Three-dimensional controllable pulling and expanding multi-cell structure based on 3D printing

A 3D printing and three-dimensional technology, applied in the field of auxetic structures, can solve the problems of low stiffness and limited controllability of the model, and achieve the effects of light weight, various forms of spatial arrays, and a wide range of controllability

Inactive Publication Date: 2017-11-07
BEIHANG UNIV
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Problems solved by technology

There are two main types of existing 3D auxetic cellular structures: 3D concave hexagonal cellular structures and 3D double arrow cellular structures. These two 3D cellular structures have auxetic effect and Poisson’s ratio is controllable , but the stiffness of these two structures is relatively small
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Method used

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  • Three-dimensional controllable pulling and expanding multi-cell structure based on 3D printing
  • Three-dimensional controllable pulling and expanding multi-cell structure based on 3D printing
  • Three-dimensional controllable pulling and expanding multi-cell structure based on 3D printing

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with specific embodiments.

[0033]The invention is a three-dimensional auxetic controllable multicellular structure based on 3D printing, and its basic constituent units are two three-dimensional unit cell structures. As shown in FIG. 1( a ), this structure is the first unit cell structure, and the unit cell includes two identical two-dimensional chiral honeycomb unit cells 21 and 22 . The two two-dimensional chiral honeycomb cells 21, 22 are first completely overlapped in space, and then the two-dimensional chiral honeycomb unit cells 22 rotate 90 degrees clockwise (or counterclockwise) with the axis 15 in the vertical direction as the center of rotation. degree (θ 3 =90°), that is, one two-dimensional chiral honeycomb unit cell 21 and another two-dimensional chiral honeycomb unit cell 22 bisect each other perpendicularly in space. Two two-dimensional chiral honeycomb unit cells 21, 22 ar...

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Abstract

The invention discloses a three-dimensional controllable pulling and expanding multi-cell structure based on 3D printing. The three-dimensional structure can be obtained by two different signal cells by means of space array; the first single cell is obtained in the manner that two two-dimensional chiral honeycomb single cells rotate by 90 degrees in space to be fixedly connected together; the second single cell is obtained in the manner that there two-dimensional chiral honeycomb single cells rotate by 60 degrees and 120 degrees in space to be fixedly connected together; and each two-dimensional chiral honeycomb single cell is obtained in the manner that two crossed and fixedly connected rods are subjected to mirror symmetry two times. The multi-cell material has the negative poisson's ratio property, when the multi-cell material is compressed in one direction, the multi-cell material can be shrunken inwards in the other two directions, and therefore the structure is more compact, and the structure can more effectively resist the compression load. Besides, by changing the slenderness ratio and the inclination angle of the first rod and the second rod, the elastic performance of the multi-cell material is adjusted.

Description

technical field [0001] The invention relates to an auxetic structure, in particular to a controllable three-dimensional auxetic multicellular structure based on 3D printing. Background technique [0002] Poisson's ratio refers to the ratio of the absolute value of the transverse normal strain to the axial positive strain when the material is under unidirectional tension or compression, also called the transverse deformation coefficient, which is an elastic constant reflecting the transverse deformation of the material. Its calculation formula is: [0003] [0004] Among them, ε x is the transverse normal strain of the material, ε y is the axial normal strain of the material. [0005] The value range of Poisson's ratio is -1 to 0.5. The well-known traditional materials generally have a positive Poisson's ratio, that is, when the material is stretched in the axial direction, it will shrink in the transverse direction, or when it is compressed in the axial direction, it w...

Claims

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Application Information

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IPC IPC(8): B22F3/11B22F3/115B22F3/00B33Y80/00B29C64/10B22F10/14B22F10/22B22F10/28
CPCB22F3/1115B22F3/115B33Y80/00B22F10/00B22F10/18B22F10/38B22F10/28B22F10/12B22F10/14Y02P10/25
Inventor 杨振宇王青松李响卢子兴
Owner BEIHANG UNIV
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