Inverted and Programmable Poynting Effects in Metamaterials.

ABSTRACT: The Poynting effect generically manifests itself as the extension of the material in the direction perpendicular to an applied shear deformation (torsion) and is a material parameter hard to design. Unlike isotropic solids, in designed structures, peculiar couplings between shear and normal deformations can be achieved and exploited for practical applications. Here, a metamaterial is engineered that can be programmed to contract or extend under torsion and undergo nonlinear twist under compression. First, it is shown that the system exhibits a novel type of inverted Poynting effect, where axial compression induces a nonlinear torsion. Then the Poynting modulus of the structure is programmed from initial negative values to zero and positive values via a pre-compression applied prior to tors

SUBMITTER: Ghorbani A 

PROVIDER: S-EPMC8529495 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature