Two-dimensional mechanical metamaterial with designable deformation and non-contact control

Abstract

The invention belongs to the technical field of metamaterials and relates to a two-dimensional mechanical metamaterial with designable deformation and non-contact control. Each single cell element comprises a deformation unit and a motion unit; each deformation unit comprises an inwards-concave n-angle shape, n connecting rods and n control blocks; one end of each connecting rod is fixedly connected with the concave n-angle shape, the other end of each connecting rod is fixedly connected with the center of one control block; the two ends, far away from the center, of each control block are connected with one movement unit in a sliding mode. In the same single cell element, each movement unit is connected with two control blocks; in the deformation unit, n connecting rods are symmetricallyand fixedly connected to the periphery of the inwards-concave n-angle shape; the deformation unit is of a star-shaped structure with the size controlled by deformation parameters; the movement unit isof a plate-shaped structure with the fixed size; a control groove is formed in a plate-shaped structure and connected with the control blocks and the movement unit in a sliding mode. The material disclosed by the invention can realize negative Poisson's ratio effect, deformation designability and non-contact control.

Description

technical field [0001] The present disclosure relates to the technical field of metamaterials, in particular to a two-dimensional mechanical metamaterial. Background technique [0002] In today's world, high-performance materials play a vital role in the sustainable development of transportation, energy power, resources and environment, agricultural construction, national defense and military, and major national projects. However, with the continuous development of modern engineering technology, the normal performance of ordinary high-performance materials can no longer meet specific needs. [0003] Metamaterials are composite materials that break through the limitations of some apparent natural laws through artificially designed structures (such as physical structures), and present supernormal material functions that natural materials do not have. [0004] Mechanical metamaterial (Mechanical metamaterial) (also known as mechanical metamaterial) broadly refers to a class of...

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Problems solved by technology

[0007] However, when the overall material has a uniform Poisson's ratio, the shape change of the material is relatively simple, and it is impossible to achieve more complex plane deformation, which leads to certain limitations in practical applications.

In addition, most of the existing mechanical metamaterials are deformed by applying direct contact force externally, which limits the application of this kind of mechanical metamaterials in scenarios where contact control cannot be satisfied.

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