Stress Rate Effect on the Pseudoelastic Behaviour of CuZnAl Single Crystals

¹ Université de Franche-Comté, Laboratoire de Mécanique Appliquée R. C, URA 004 du CNRS, 25000 Besançon cedex, France
² Université de Montpellier II, Laboratoire de Mécanique et de Génie Civil, URA 1214 du CNRS, 34095 Montpellier cedex 05, France

Abstract

Tensile pseudoelastic tests performed on elaborated single crystals show that the width of hysteresis loops and the slope of the stress-strain curves during phase transformation increase as the applied stress rate increases. In the first elementary model without mechanical dissipation, the integration of heat equation permits the qualitative description of hysteresis loop. The second model with a non-convex free energy and mechanical dissipation allows us a quantitatively good modeling of loading rate effects.