FINITE-ELEMENT MODELING OF THE INFLUENCE OF ANISOTROPIC MATERIAL PROPERTIES ON DISLOCATIONS IN METALS

Theories of work hardening have been based on the occurrence of disloc ation cell structures whose formation has significant influence on mat erial properties in metals. In the present work, finite element (FE) m odelling was used to investigate the effect of anisotropy in the grain s on the dislocation density during tensile deformation. The deformati on within several grains was considered in this FE-model. In each grai n, different anisotropic elastic moduli, yield strengths and the activ e slip systems were taken into account. The dislocation density was in directly determined by simulating the distribution of the elastic stra ins after unloading. Such distribution was found to be similar to the occurrence of mosaic blocks and is influenced by the grain size, the c hanges of local anisotropic yield strengths and of the local active sl ip systems within each grain. (C) 1998 Elsevier Science S.A. All right s reserved.