Abstract
Crystal plasticity finite element (CPFE) simulations were performed on the representative volume elements (RVE) modeling body centered cubic (bcc) single, bi- and tri-crystals. The RVE model was designed to include a void inside a grain, at a grain boundary and at a triple junction. The effect of single crystal orientation on the flow strength and growth rate of the void was discussed under prescribed boundary conditions for constant stress triaxialities. CPFE analyses could explain the effect of inter-grain orientations on the anisotropic growth of the void located at the grain boundaries. The results showed that the rate of void growth had preferred orientation in a single crystal, but the rate could be significantly different when other orientations of neighboring crystals were considered.
Highlights
Engineering structure materials used for the manufacturing processes generally require higher strength, prolonged plasticity with good ductility, weldability, creep resistance and enhanced fatigue properties among others
The present study aims to investigate the effects of crystal orientation and existence of grain boundary growth.The
A unit cell containing a void was modeled in the finite element simulations and different boundary conditions were applied to investigate the void behavior during plastic deformation
Summary
Engineering structure materials used for the manufacturing processes generally require higher strength, prolonged plasticity with good ductility, weldability, creep resistance and enhanced fatigue properties among others. Srivastava and Needleman adopted crystal plasticity and the RVE model with a single void to study the effect of crystal orientation on porosity and evolution of creep strain evolution They found that the Lode parameter as a measure of stress state considerably affected the creep strain [16]. The present work provides simulation based investigation, which should be further validated by experiments Even with this limitation, the current work is still meaningful considering recent advances in the computational approach based on crystal plasticity, which accurately predicts the anisotropic deformation response of cubic crystals under complex loading conditions [7,13,14,15,16,17,18,19]
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