Abstract：The influences of cycle number and deformation rate on mechanical characteristics of shape memory alloy( SMA) are investigated through cyclic loading experiments of SMA under different deformation rate. The results show that the phase transformation stresses,residual strain,equivalent damping ratio of SMA under cyclic loading decrease as the cycle number increasing,and finally the mechanical characteristics of SMA arrive at a stable state. The phase forward transformation stresses and equivalent damping ratio increase,and the phase reverse transformation stresses decrease as deformation rate increasing. Meanwhile,the mechanical characteristics arrive at stability as the deformation rate increasing at a certain range. In addition,the deformation rate of SMA under the cyclic loading has not significant influence on the mechanical characteristic of stable SMA. These results will give a reference for SMA mechanical training and SMA damper design.

Keyword：shape memory alloy;deformation rate;cyclic loading;mechanical characteristics;