Nonclassical Thermal Twist of the Chiral Gyroid Lattice

Abstract

The gyroid lattice is prepared in chiral and non‐chiral forms. The chiral gyroid lattice is observed to exhibit temperature‐induced twist with the direction of twist corresponding to the sense of chirality. This effect is a nonclassical effect that cannot occur in classical elasticity or classical thermo‐elasticity but is allowable in Cosserat solids. Poisson's ratio of the gyroid is known to be about 0.3 with minimal dependence on size. In contrast to squeeze–twist coupling in which substantial size effects occur with slender specimens twisting much more than thicker ones, thermal–twist coupling exhibits opposite and less consistent size effects of much smaller magnitude.

Auxetics and Other Systems with Unusual Characteristics

“…This non‐classical effect cannot occur in classical thermo‐elasticity but is allowable in Cosserat solids. [ 17 ]…”