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A three-dimensional controllable auxetic cellular structure based on 3D printing

A 3D printing, three-dimensional technology, applied in the field of auxetic structures, can solve the problems of limited controllability and low stiffness of the model, and achieve the effect of various forms of spatial arrays, light weight, and resistance to compressive loads

Inactive Publication Date: 2019-01-29
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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
Lu et al. proposed a three-dimensional cross-chiral polycellular structure based on two-dimensional cross-chiral honeycomb. Although compared with the previous two structures, this structure has auxetic effect and higher stiffness, but the controllability of the model is limited. The change range of loose ratio is only -1~0

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  • A three-dimensional controllable auxetic cellular structure based on 3D printing
  • A three-dimensional controllable auxetic cellular structure based on 3D printing
  • A three-dimensional controllable auxetic cellular 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 auxetic multicellular structure based on 3D printing. The three-dimensional structure can be respectively obtained by two different unit cells through spatial arrays. The first unit cell is composed of two two-dimensional The unit cells of the chiral honeycomb are obtained by rotating 90 degrees in space and then affixed together. The second type of unit cell is obtained by affixing the unit cells of three two-dimensional chiral honeycombs together by rotating 60 degrees and 120 degrees in space. Yes, the unit cell of the two-dimensional chiral honeycomb is obtained by two crossed and fixed rods undergoing mirror symmetry twice. The cellular material can have a negative Poisson's ratio. When compressed in one direction, it shrinks inward in the other two directions, making the structure denser and more effective against compressive loads. In addition, the elastic properties of cellular materials can be tuned by changing the slenderness ratio and inclination angle of the first and second rods.

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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Patent Type & Authority Patents(China)
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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