J. Phys. IV France 05 (1995) C8-215-C8-220
Finite Elements Simulation of Mechanical Behaviour of Shape Memory Alloys Coupled with a Non-Stationary Thermal FieldG. Rio1, D. Favier2 and H. Desplats1
1 LG2M, Université de Bretagne Sud, CGI, Guidel-Plages, 56520 Guidel, France
2 3S, URA 1511 du CNRS, Université J. Fourier, BP. 53X, 38041 Grenoble cedex, France
The main deformation mechanism of shape memory alloys (SMA) are related to martensitic transformation and/or martensitic reorientation. These phenomena lead to heat production resulting from the transformation and/or from internal dissipation processes. As the SMA behaviour is strongly temperature dependent, its modelling has to take into account thermomechanical coupling. A 3-dimensional finite element code has been designed for that purpose. The quasi-static mechanical behaviour is described through the temperature dependent elastohysteresis model. Large displacements and large deformations are considered. The numerical problem is strongly non-linear and an implicit resolution scheme has been adopted. Two coupled thermomechanical calculations are presented. The first one deals with the one-way memory effect of a cantilever beam. The second one simulates the non-stationary thermal and mechanical fields of this beam during a near-adiabatic pseudoelastic bending.
© EDP Sciences 1995