A NOVEL ONE-DIMENSIONAL CONSTITUTIVE MODEL FOR SHAPE MEMORY ALLOYS

Achille Arantes Bassi¹; Marcelo Amorim Savi¹

¹ COPPE/UFRJ

doi:10.20906/CPS/COB-2015-0301

Resumo

This paper presents a novel constitutive model to describe the thermomechanical behavior of shape memory alloys (SMAs). The proposed model is developed within the scope of the standard generalized material formalism. Inelastic behavior includes both phase transformation and classical plasticity. Solid phase transformations are described considering four macroscopic phases representing three variants of martensite and an austenitic phase. Classical plasticity is described considering both kinematic and isotropic hardening. Under these assumptions, the proposed model can fit threshold stress-temperature curves from the transformation surfaces representing multiple simultaneous phase transformation processes. Numerical simulations are carried out establishing a comparison with experimental data available in literature.

Palavras-chave: SMA; Constitutive Model; Shape Memory Effect; Pseudo-elasticity; Rate Independent