Mechanical metamaterial unit cells and structures

Abstract

The present application relates to a kind of mechanical metamaterial units, including two rows of components arranged left-right symmetrically;Each column of components includes upper layer column piece, middle layer special-shaped piece and lower layer column piece connected in order from top to bottom;The strength inside middle layer special-shaped piece is greater than the strength outside;Middle layer special-shaped piece outside is equipped with middle cross column, middle cross column is inserted into middle layer special-shaped piece, and the upper and lower ends of middle cross column are all left with fan-shaped angle gap between middle layer special-shaped piece.The present application also relates to a kind of mechanical metamaterial structure, including multiple mechanical metamaterial units, multiple mechanical metamaterial units are arranged in matrix and spliced.Under the action of small load, mechanical metamaterial unit appears negative poisson's ratio phenomenon.Under the action of large load, mechanical metamaterial unit appears positive poisson's ratio phenomenon.The mechanical metamaterial unit provided by the present application can be converted between positive poisson's ratio and negative poisson's ratio in compression state alone.

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