Abstract
To give the two-way shape memory effect to a shape memory alloy (SMA), shot peening treatment is locally applied to the SMA. Plastic deformation occurs on the shot region, and the region behaves like a bias-spring. In this report, a simple constitutive model of SMA, which can capture plastic deformation behavior as well as phase transformation behavior precisely, is developed, to design the two-way SMA actuator optimally. This model is based on the one-dimensional phase transformation model one of the present authors proposed. Stress-strain curves of a SMA wire including plastic deformation and fracture are measured and simulated by using the developed model. Comparison between them shows that this simple model can express the features of the stress-strain curves quantitatively.
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