Abstract
Compared with the traditional hexagonal honeycombs with positive Poisson's ratio, chiral metastructures have negative Poisson's ratio property, elevated transverse shear modulus and enhanced impact energy absorption performance, etc. In this study, the in-plane dynamic mechanical behaviors of ordinary anti-tetra-chiral honeycombs (ATH) consisting of straight ligaments with flat cross section and enhanced anti-tetra-chiral metastructures composed of rolled ligaments with curved cross section (RATH) are investigated and compared. The effects of geometric parameters of chiral structure, including α (the ratio of ligament length to ring radius),β (the ratio of ligament thickness to ring radius), γ (the ratio of ligament curvature to ring radius) and impact velocity on the plateau stress are analyzed with numerical simulation method. Theoretical formulas of the Poisson's ratio under the quasi-static compression and plateau stress are derived on the basis of the deformation modes of the metastructure at different impact velocities, and the results obtained from the analytical model are in good agreement with the numerical simulation results.
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