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

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...

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