Poisson's ratio and young's modulus of TiNi shape memory alloy n measured by electromagnetic acoustic transducer

Abstract

In order to investigate the elastic behavior of TiNi shape memory alloy (SMA), Young's modulus (E) and Poisson's ratio (v) of TiNi SMA during a martensitic transformation process were measured by two methods using mechanical strain gauge and electromagnetic acoustic transducer (EMAT). In particular, EMAT is able to measure the E and v of materials under static loading condition. As the results, E and v measured by two different methods were almost the same values. The correlation of E obtained by EMAT and by the stress-strain diagram under a martensitic transformation process was become clear.