Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 257, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201900140
Keywords
auxetics; chirality; Cosserat elasticity; isotropy; negative Poisson's ratio
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Funding
- National Science Foundation [MSN224624, CMMI 1906890]
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A chiral 3D lattice is designed, made by 3D printing, and studied experimentally. The lattice exhibits squeeze-twist coupling and a Poisson's ratio near zero. Squeeze-twist coupling does not occur in classical elasticity which makes no provision for chirality. By contrast, chiral effects are allowed in Cosserat elasticity. An experimental squeeze-twist coupling strain ratio on the order of unity and a Poisson's ratio near zero are in reasonable agreement with prior finite element analysis of a lattice with similar structure, for which negative Poisson's ratio is anticipated for a sufficient number of cells.
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