Metamaterial structure with negative Poisson ratio and thermal expansion capable of being regulated simultaneously

Abstract

The invention provides a metamaterial structure with negative Poisson ratio and thermal expansion capable of being regulated simultaneously. The metamaterial structure comprises at least one honeycomb unit; the honeycomb unit comprises a concave honeycomb base structure made of a material I and fitting parts made of a material II; the concave honeycomb base structure comprises a group of concave bent rods which are arranged at intervals, the concave bent rods are connected into a whole through straight rods, each concave bent rod comprises a repeating unit formed by connecting at least one convex arc section and at least one concave arc section, and the repeating units extend reversely and symmetrically to form a concave shape; the fitting parts are fitted along the outer side contours of the convex arc sections and the concave arc sections; and the thermal expansion coefficient of the material II is larger than that of the material I. According to the metamaterial structure, the shear capacity, fracture resistance, energy absorption, indentation resistance and other properties of the structure are ensured, and the characteristic of being capable of regulating the thermal expansion of the whole structural member is improved. The whole honeycomb unit is of an antisymmetric deformation bent structure, and the performance requirement for high rigidity is met.

Description

technical field [0001] The invention relates to the technical field of mechanical metamaterial structures, in particular to a metamaterial structure in which negative Poisson's ratio and thermal expansion can be regulated simultaneously. Background technique [0002] Negative Poisson's ratio materials are also called auxetic materials, which have more advantages than traditional materials in terms of shear resistance, fracture resistance, energy absorption and indentation resistance. Therefore, negative Poisson's ratio materials are used in aerospace, medical equipment, Protective equipment and daily life and other fields have broad application prospects. Negative Poisson's ratio materials started to be studied earlier, with a wide range of applications and great advantages, so they have been fully researched and developed. [0003] The current mainstream design forms of metamaterials with adjustable thermal expansion include bending-dominant type and tension-dominant type:...

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Problems solved by technology

[0004] Since in the actual working environment, the structure will be affected by the thermal field and the force field at the same time, however, there are only scattered cases for the research design of metamaterials with negative Poisson's ratio and thermal expansion that can be adjusted simultaneously. Tuned metamaterial structures are even rarer

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