Stiff and strong Octet lattice with tunable coefficient of thermal expansion

Abstract eng:
In this paper, we present two versions of a bi-material Octet lattice, and show that its coefficient of thermal expansion (CTE) can be regulated in designated spatial directions without compromising its structural efficiency. Proof-of-concept lattices are fabricated by laser cutting and assembled by a pretension snap-fit method. Via experiments, simulations and theory, we prove that their CTE can be tailored to low-to-zero or even negative. In particular, digital image correlation is used to measure the CTEs of the two versions of the Octet lattice, whereas asymptotic homogenization theory and finite element simulations are used to calculate their thermomechanical properties. The results are plotted into thermomechanical charts that illustrate the merit of the Octet lattices over other concepts existing in literature.

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