LATTICE METAMATERIAL HAVING PROGRAMED THERMAL EXPANSION

摘要

A metamaterial having a programmed thermal expansion when exposed to a temperature condition is described. The metamaterial includes a lattice structure composed of a plurality of interconnected unit cells, each of the unit cells comprising two or more bi-material building blocks having first material elements and second material elements. The first material elements have a first coefficient of thermal expansion (CTE) and the second material elements having a second CTE, the first CTE being greater than the second CTE. The bi-material building blocks have a topology with two or more vertices formed at junctions between said first material elements and said second material elements. One of the first material elements interconnects and extends between two of the second material elements at the vertices. The first material elements deforming substantially long a longitudinal axis thereof to cause the bi-material building blocks to be stretch-dominated when deforming in response to temperature changes.