**Negative Poisson's ratio in cubic materials along principal directions**

DT Ho and SD Park and SY Kwon and TS Han and SY Kim, PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 253, 1288-1294 (2016).

DOI: 10.1002/pssb.201600017

This report employed molecular statics simulation and density- functional-theory calculation to study the Poisson's ratios of face- centered-cubic materials. We provide numerical and theoretical evidences to show that cubic materials can exhibit auxetic behavior in a principal direction under proper loading conditions. When a stress perpendicular to the loading direction is applied, cubic materials can exhibit a negative Poisson's ratio at finite strain. The negative Poisson's ratio behavior, including its direction and value, is highly dependent on the direction and magnitude of the transversely applied stresses. As a result, we show that it is possible to tune the direction and magnitude of the negative Poisson's ratio behavior of cubic materials by controlling the transverse loadings. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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