Experimental Research on Thermal-mechanical Properties of Shape Memory Alloys

More attentions have been paid to Shape Memory Alloys (SMAs), which is a kind of excellent functional materials. In this work, a special device was designed for the test of the mechanical behaviors of SMAs, which includes three modules, separately: tension module, torsion module and temperature-controlled cabinet. In work, it will be assembled on Mechanical Testing & Simulation MTS-858. The typical thermal-mechanical properties of SMAs were investigated systematically, involving the responses and the heating-induced strain recovery under proportional and nonproportional tensile-torsional loadings at various temperatures. The results show that the response of the SMAs under pure tension is quite different from that under pure torsion. In the case of constrained heating-induced recovery stress, it is found that the recovery resistance increases with the increase of pre-deformation. Recovery stress at various recovery strains and the thermal-mechanical properties of the SMAs subjected to cyclic straining were investigated