A bi-material structure with Poisson's ratio tunable from positive to negative via temperature control

作者：Li, Dong^*; Ma, Jie; Dong, Liang; Lakes, Roderic S.

来源：Materials Letters, 2016, 181: 285-288.

DOI：10.1016/j.matlet.2016.06.054

• Thermal properties
• Negative poisson's ratio
• Simulation and modelling
• Elastic properties

In this paper, a two-dimensional quadrilateral cellular structure made from bi-material strips was designed and its thermal, deformation behaviors were studied via experimental, analytical and numerical approaches. It has been shown that the cell shape of the structure can be tuned from convex to concave (or vice versa) and hence the Poisson's ratio from positive to negative (or vice versa) with a change in temperature. At any specific temperature with a non-zero Delta T, the absolute value of the structure's Poisson's ratio decreased rapidly at first with an increasing compression strain epsilon(y) and then more slowly as it approached a constant of approximately 1 when epsilon(y) > 0.1. A maximum absolute value of the Poisson's ratio of approximately 12 was found at epsilon(y) = 0.001 at a 10 degrees C temperature change.

• 出版日期2016-10-15
• 单位东北大学