形状記憶合金に生ずる相変態と塑性変形を表す構成方程式モデル

抄録

A constitutive model of shape memory alloys (SMAs) including phase transformation and plastic deformation is proposed. This model is based on the one-dimensional phase transformation model in which the austenite and the martensite phases transform one-dimensionally. A form of the yield function is assumed to the same as the driving energy minus the required transformation energy for the phase transformation. To show the validity of this model, a cyclic twisting test of an SMA shaft is simulated numerically. The result shows that the proposed model can reproduce the stress-strain-temperature relationship during the phase transformation and the plastic deformation qualitatively.