J. Phys. IV France
Volume 05, Numéro C8, Décembre 1995
International Conference on Martensitic Transformations – ICOMAT 95
Page(s) C8-203 - C8-208
International Conference on Martensitic Transformations

J. Phys. IV France 05 (1995) C8-203-C8-208

DOI: 10.1051/jp4:1995827

Thermodynamic Modelling of Shape Memory Behaviour : Some Examples

R. Stalmans, J. Van Humbeeck and L. Delaey

Department of Metallurgy and Materials Engineering, Catholic University of Leuven, de Croylaan 2, 3001 Heverlee, Belgium

This paper gives a general view of a recently developed thermodynamic model of the thermoelastic rnartensitic transformation. Unlike existing empirical, mathematical or thermodynamic models, this generalised thermodynamic model can be used to understand and describe quantitatively the overall thermomechanical behaviour of polycrystalline shape memory alloys. Important points of difference between this and previous thermodynamic models are that the contributions of the stored elastic energy and of the crystal defects are also included. In addition, the mathematical approach and the assumptions in this model are selected in such a way that the calculations yield close approximations of the real behaviour and that the final mathematical equations are relatively simple. Several illustrations indicate that this model, in contrast to other models, can be used to understand the shape memory behaviour of complex cases. As an example of quantitative calculations, it is shown that this modelling can be an effective tool in the "design" of multifunctional materials consisting of shape memory elements embedded in matrix materials.

© EDP Sciences 1995