Three-dimensional negative Poisson's ratio structure suitable for 3D printing

A negative Poisson's ratio, 3D printing technology, applied in the direction of processing and manufacturing, additive processing, etc., can solve the problems of negative Poisson's ratio structure cannot be formed, structure manufacturability limitations, etc., to achieve the effect of stable platform stress and high performance

Pending Publication Date: 2021-08-31
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of 3D printing technology in terms of structural manufacturability, many conventional negative Poisson's ratio structures cannot be formed by 3D printing technology

Method used

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  • Three-dimensional negative Poisson's ratio structure suitable for 3D printing
  • Three-dimensional negative Poisson's ratio structure suitable for 3D printing
  • Three-dimensional negative Poisson's ratio structure suitable for 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1, see Figure 7 a- Figure 7 c, the number of helical arms 1 of each helical unit 100 is three, the planar helical structure takes the inner end 11 of the helical arm 1 as the center of rotation, and the helical arm 1 takes 120° as the step size circular array 3 times to obtain the helical unit 100 , the two adjacent spiral units 100 on the X-axis, Y-axis and Z-axis (up and down) are mirror images, and the upper and lower adjacent spiral units 100 are connected by three inclined rods 2, and the upper and lower ends of the inclined rods 2 are respectively connected to the spiral The outer ends 12 of the unit 100 are connected.

Embodiment 2

[0032] Example 2, see Figure 7 d- Figure 7 f, the number of helical arms 1 of each said helical unit 100 is four, the planar helical structure takes the inner end 11 of the helical arm 1 as the center of rotation, and the helical arm 1 takes 90° as the step-length circular array 4 times to obtain the helical unit 100 , the two adjacent spiral units 100 on the X-axis, Y-axis and Z-axis (up and down) are mirror images, and the upper and lower adjacent spiral units 100 are connected by four inclined rods 2, and the upper and lower ends of the inclined rods 2 are respectively connected to the spiral The outer ends 12 of the unit 100 are connected.

Embodiment 3

[0033] Example 3, see Figure 7 g- Figure 7 i, the number of helical arms 1 of each said helical unit 100 is six, the planar helical structure takes the inner end 11 of the helical arm 1 as the center of rotation, and the helical arm 1 takes 60° as the step size circular array 6 times to obtain the helical unit 100 , the two adjacent spiral units 100 on the X-axis, Y-axis and Z-axis (up and down) are mirror images, and the upper and lower adjacent spiral units 100 are connected by six inclined rods 2, and the upper and lower ends of the inclined rods 2 are respectively connected to the spiral The outer ends 12 of the unit 100 are connected.

[0034] Taking Embodiment 2 as an example, when a reverse load is applied to the screw unit 100 in the Z-axis direction (pull the upper screw unit 102 upward, and pull the lower screw unit 101 downward), for example, please refer to image 3, the lower screw unit 101 below the tilt rod 2 rotates clockwise, and the upper screw unit 102 a...

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Abstract

The invention provides a three-dimensional negative Poisson's ratio structure suitable for 3D printing. According to the structure, a spiral unit is formed by annularly arraying a spiral arm with the inner end as the center, the multiple spiral units are sequentially arranged on the plane, every two adjacent spiral units are arranged in a mirror image mode and fixedly connected, the spiral units of every two adjacent planar spiral structures are in one-to-one correspondence in the vertical direction and are arranged in a mirror image manner, and the outer ends of the spiral arms of every two vertically adjacent spiral units are in one-to-one correspondence and are connected through inclined rods. The technical scheme has the beneficial effects that the structure has high negative Poisson's ratio performance and is suitable for 3D printing, and in a compression experiment, the negative Poisson's ratio structure has typical negative Poisson's ratio deformation characteristics and typical bending-dominated mechanical response; and the negative Poisson's ratio structure has very stable platform stress in a relatively large compression strain interval, and does not have any sharp collapse and catastrophic damage, so that the reasonability of the design of the negative Poisson's ratio structure is embodied, and a rare opportunity is provided for designing a high-strain or anti-impact functional device.

Description

technical field [0001] The invention relates to the technical field of negative Poisson's ratio structures, in particular to a three-dimensional negative Poisson's ratio structure suitable for 3D printing. Background technique [0002] It is generally believed that almost all materials have a positive Poisson's ratio, about 1 / 3, rubber materials are 1 / 2, metal aluminum is 0.133, copper is 0.127, and typical polymer foams are 0.11 to 0.14, etc., that is, these The transverse direction of the material shrinks when the material is stretched. The negative Poisson's ratio effect means that when stretched, the material expands laterally within the elastic range; while when compressed, the material shrinks laterally. This phenomenon is thermodynamically possible, but negative Poisson's ratio effects are not generally observed in materials. Some materials with special structures discovered in recent years have a negative Poisson's ratio effect, and have attracted much attention fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C64/10B33Y10/00B33Y80/00
CPCB33Y10/00B33Y80/00B29C64/10
Inventor 熊玮郝亮潘瑞琪
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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