International Seminar on Mechanics and Mechanisms of Solid-Solid Phase Transformations
J. Phys. IV France 06 (1996) C1-235-C1-244
Finite Element Simulations of Internal Stresses Generated During the Ferroelastic Deformation of NiTi BodiesP.Y. Manach1, D. Favier2 and G. Rio1
1 Laboratoire de Génie Mécanique et Matériaux, Centre de Génie Industriel, Guidel Plages, Université de Bretagne Sud, 56520 Guidel, France
2 Laboratoire des Sols, Solides et Structures, Unité de Recherche Associée au CNRS n°1511, Université Joseph Fourier, BP. 53X, 38041 Grenoble
The aim of this paper is to analyse the generation of internal stresses during the predeformation of NiTi shape memory alloys in the martensitic state. This allows to determine the initial stress state in which the material will transform during the shape memory effect due to heating consecutively to this prestrain. In that way a three-dimensional finite element model of the deformation of shape memory alloys has been developed, the constitutive law being defined using an elastohysteresis tensor model. The influence of behavioural and geometrical factors are illustrated considering the numerical simulation of different cases of practical importance for industrial applications : the study of the bending behaviour of a NiTi cantilever beam as well as the study of the swelling of a pipe connection under both uniform and non uniform internal displacement fields.
© EDP Sciences 1996