Heterogeneous superstructure with adjustable thermal expansion coefficient

Abstract

The invention belongs to the technical field of additive manufacturing, and particularly relates to a heterogeneous superstructure with an adjustable thermal expansion coefficient. The superstructure comprises a plurality of periodic superstructure cell elements, each superstructure cell element comprises twelve heterogeneous curved beams, every two heterogeneous curved beams are connected at the 1 / 4 position of the concave side of the heterogeneous curved beams in a plane, six transverse beams and six vertical beams form an eight-claw-shaped chiral symmetrical structure, and the thermal expansion coefficient of convex side materials of the heterogeneous curved beams is larger than that of concave side materials of the heterogeneous curved beams. The effect of adjusting the thermal expansion coefficient of the heterogeneous curved beam and the whole cell element is achieved by adjusting the thermal expansion coefficient of the material or the ratio of the length of the material on the convex side of the heterogeneous curved beam to the length of the curved beam. When external force acts on the superstructure cells, the material also shows unique negative Poisson's ratio behavior. The structural design is integrated into the industrial design of the precise instrument, the instrument precision of the precise instrument in the environment with large working temperature change can be improved, the result accuracy is improved, and the negative Poisson's ratio structure enables the precise instrument to adapt to work in more environments.

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