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Flexible Cube Tilt Lattice with Anisotropic Cosserat Effects and Negative Poisson's Ratio
Author(s) -
Rueger Zach,
Ha Chan Soo,
Lakes Roderic S.
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800512
Subject(s) - auxetics , torsion (gastropod) , anisotropy , poisson's ratio , elasticity (physics) , poisson distribution , materials science , lattice (music) , condensed matter physics , composite material , mechanics , mathematics , physics , optics , medicine , statistics , surgery , acoustics
A 3D lattice structure consisting of pivoting cubes with flexible links at the corners is presented. It exhibits anisotropic negative Poisson's ratio −0.54 and −0.75. Size effects occur in torsion and bending; these effects are consistent with Cosserat elasticity but not with classical elasticity. Cosserat elastic solids exhibit sensitivity to strain gradients; size effects occur in torsion and bending; also reduction in stress concentrations. The observed Cosserat effects also reveal anisotropy.