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Controllable thermal expansion of large magnitude in chiral negative Poisson's ratio lattices
Author(s) -
Ha Chan Soo,
Hestekin Eric,
Li Jianheng,
Plesha Michael E.,
Lakes Roderic S.
Publication year - 2015
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.201552158
Subject(s) - thermal expansion , negative thermal expansion , thermoelastic damping , poisson's ratio , lattice (music) , planar , materials science , condensed matter physics , thermal , poisson distribution , bimetallic strip , thermodynamics , physics , mathematics , composite material , metal , statistics , computer graphics (images) , acoustics , computer science , metallurgy
Lattices of controlled thermal expansion are presented based on planar chiral lattice structure with Poisson's ratio approaching − 1 . Thermal expansion values can be arbitrarily large positive or negative. A lattice was fabricated from bimetallic strips and the properties analyzed and studied experimentally. The effective thermal expansion coefficient of the lattice is about α = − 3.5 × 10 − 4 K− 1 . This is much larger in magnitude than that of constituent metals. Nodes were observed to rotate as temperature was changed corresponding to a Cosserat thermoelastic solid.