STRESS RATE EFFECT ON THE PSEUDOELASTIC BEHAVIOR OF CUZNAL SINGLE-CRYSTALS

Tensile pseudoelastic tests performed on elaborated single crystals sh ow that the width of hysteresis loops and the slope of the stress-stra in curves during phase transformation increase as the applied stress r ate increases. In the first elementary model without mechanical dissip ation, the integration of heat equation permits the qualitative descri ption of hysteresis loop. The second model with a non-convex free ener gy and mechanical dissipation allows us a quantitatively good modeling of loading rate effects.