J. Phys. IV France 11 (2001) Pr5-301-Pr5-308
A polycrystalline model for stress-strain behaviour of tantalum at 300 KS. Frénois1, E. Munier1, X. Feaugas2 and P. Pilvin3
1 CEA, Centre de Valduc, 21120 Is-sur-Tille, France
2 Université de Technologie de Compiègne, Laboratoire Roberval, UMR 6066 du CNRS, BP. 20529, 60205 Compiègne cedex, France
3 École Centrale Paris, Laboratoire MSS-MAT, 92295 Châtenay-Malabry cedex, France
A polycrystalline model is proposed to model the large plastic deformation and texture evolutions in tantalum over a wide range of strain rates at room temperature. The mechanical behaviour is discussed in terms of back and effective stresses with the help of qualitative and quantitative TEM observations, Using these observations, an elasto-visco-plastic formulation for b.c.c. crystals is developed in the thermal activation framework.
© EDP Sciences 2001