3 results about "Metamaterial" patented technology

The invention discloses a preparation method of a negative thermal expansion metamaterial sandwich panel based on topological optimization design. The preparation method comprises the following steps: (1) establishing an overall structure model of the negative thermal expansion metamaterial sandwich panel; (2) establishing a metamaterial-based structure finite element model for filling the sandwich panel; (3) inputting basic material parameters, constraint values and a finite element model of the metamaterial-based structure; (4) calculating values of an equivalent thermal expansion coefficient and an equivalent elastic modulus of the metamaterial and corresponding partial derivatives; (5) establishing an explicit optimization model, and solving through linear programming; (6) judging whether the equivalent thermal expansion coefficient convergence precision is met or not, and if the equivalent thermal expansion coefficient convergence precision is not met, returning to the fourth step; and if the equivalent thermal expansion coefficient convergence precision is met, inverting the optimal continuous topological variable until the equivalent elastic modulus requirement is met, to obtain an optimal topological structure; and (7) modeling the filled metamaterial, and filling the negative thermal expansion metamaterial in a periodic array between clamping plates to form the negative thermal expansion sandwich plate. The method has more design freedom degrees and better performance.