Superelasticity is one of the important mechanical properties of shape memory alloy (SMA). In the present paper, the superelastic behavior of TiNi SMA under various loading conditions with different experimental temperatures and strain rates was investigated. The characteristics of transformation stress during full and partial cyclic deformation were analyzed. After mechanical training with cyclic deformation, two-way deformation appears during the heating and cooling process under no load. The modulus of elasticity during the internal loop is expressed by the mixed rule with the function of transformation strain.
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