EFFECT OF ELASTICITY ON SLIP SYSTEM ACTIVITY IN FACE-CENTERED-CUBIC CRYSTALS - A NUMERICAL STUDY

The effect elasticity may play on the number of active slip systems in face-centered cubic (fee) crystals in polycrystalline metals is inves tigated. In this work, an elastoviscoplastic polycrystalline model is used for the analysis. The deformation in each crystal is assumed to b e composed of three parts, plastic slip along crystallographic slip sy stems, an elastic stretch of the lattice and a rigid rotation of the l attice. It is commonly believed that for metals at large strains, the elastic part of the deformation can be neglected in many cases. It has been shown that al least five slip systems must be active to accommod ate any arbitrary plastic deformation. In this study, it is shown that , with the inclusion of elasticity, the model predicts that a signific ant number of grains have less than five active slip systems, even at large strains. In addition, it TS also found that the number of active slip systems is significantly affected by the valves of the elastic c onstants.