Abstract
Composites containing shape memory alloys in the shape of fibers are well-known for their use as actuators in adaptive structures. So the thermomechanical behavior of thin shape memory wires presents some interest. In the present study, the stress assisted two way memory effect (SATWME) is used: the specimens are thermally cycled under a constant load. This effect is similar to the shape memory effect but both the cooling and the heating are performed under a constant stress. During the cooling, the martensite is oriented by the stress and the strain is large. During the heating the sample recovers its original shape (elastic strain of the austenitic phase). In the present paper measurements of SATWME in two commercial wires 0.5 mm diameter are reported and some thermoelastic fatigue results are developed.
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