A multiscale model based on intragranular microstructure - Prediction of dislocation patterns at the microscopic scale

Gérald Franz (1) , Farid Abed-Meraim (2) , Tarak Ben Zineb (3) , Xavier Lemoine , Marcel Berveiller (1)

1 LPMM - Laboratoire de physique et mécanique des matériaux
2 MeNu
3 LEMTA - Laboratoire d'Energétique et Mécanique Théorique et Appliquée

A large strain elastic-plastic single crystal constitutive law, based on dislocation annihilation and storage, is implemented in a new self-consistent scheme, leading to a multiscale model which achieves, for each grain, the calculation of plastic slip activity, with help of regularized formulation drawn from visco-plasticity, and dislocation microstructure evolution. This paper focuses on the relationship between the deformation history of a BCC grain and induced microstructure during monotonic and two-stage strain paths.

Mots clés: crystal plasticity; microstructure; dislocations; complex strain paths; dislocation structure; crystal microstructure; viscoplasticity; numerical analysis; crystal plasticity

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des solides [physics.class-ph]; Génie des procédés; Mécanique des matériaux [physics.class-ph]; Mécanique des solides [physics.class-ph]; Génie mécanique [physics.class-ph]; Génie mécanique [physics.class-ph]

Gérald Franz, Farid Abed-Meraim, Tarak Ben Zineb, Xavier Lemoine, Marcel Berveiller. A multiscale model based on intragranular microstructure - Prediction of dislocation patterns at the microscopic scale. 10th ESAFORM Conference on Material Forming, Apr 2007, Zaragoza, Spain. pp.47-52, ⟨10.1063/1.2729486⟩. ⟨hal-00656182⟩