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Article Dans Une Revue Mechanics of Materials Année : 2010

Coupling between measured kinematic fields and multicrystal SMA finite element calculations

Résumé

Experimental and numerical analysis of the effect of stress-strain heterogeneities (due to elastic anisotropy, grain orientations and interactions) on martensitic transformation are investigated here for a Cu-Based SMA multicrystal. The shape and crystallographic orientation of each grain are measured successively by optical microscopy and Electron Back Scattered Diffraction (EBSD) technique. During a tensile loading at room temperature, the displacement field of the free surface is measured by Digital Image Correlation (DIC) with the software CORRELI-Q4 [Roux, Hild, 2006: Besnard et al., 2006]. The strain field is then derived numerically. A finite element model is designed. The shape of each grain is defined as a subdomain and meshed by three dimensional continuum elements. A behavior law, describing the thermomechanical response of a SMA single crystal, is adopted and implemented into the Abaqus (R) finite element code. It is based on a micromechanical approach and takes into account the various possible active martensitic variants. The study shows that the experimental and numerical results are in good agreement. Moreover, the stress state in grains is disturbed by the neighboring grains and this disturbance has a strong influence on the martensite variant activation. Finally, the study shows that the martensitic transformation mainly occurs in localized bands involving the well crystallographic oriented grains with respect to the loading direction.

Dates et versions

hal-01767998 , version 1 (16-04-2018)

Identifiants

Citer

Tarek Merzouki, Christophe Collard, N. Bourgeois, Tarak Ben Zineb, Fodil Meraghni. Coupling between measured kinematic fields and multicrystal SMA finite element calculations. Mechanics of Materials, 2010, 42 (1), pp.72-95. ⟨10.1016/j.mechmat.2009.09.003⟩. ⟨hal-01767998⟩
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