Multiaxial mechanical proportional loadings on shape memory alloys undergoing phase transformation permit to determine the yield curve of phase transformation initiation in the stress space. We show how to transport this yield surface in the set of effective transformation strains of producted phase M. Two numerical applications are done concerning a Cu Al Be and a Ni Ti polycrystallines shape memory alloys. A special attention is devoted to establish a convexity criterium of these surfaces.
Moreover an application to the determination of the phase transformation surface around the crack tip for SMA fracture is performed.
At last some datas are given concerning the SMA damping behavior
AUTHORS
Christian Lexcellent, Rachid Laydi, Emmanuel Foltete, Manuel collet and Frédéric Thiebaud
FEMTO-ST Département de Mécanique Appliquée Université de Franche Comte Besançon France