|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Investigation of Slip Transfer across Phase Boundaries with Application to Cold Dwell Facet Fatigue
||Zebang Zheng, Daniel S Balint, Fionn P.E. Dunne
|On-Site Speaker (Planned)
Discrete dislocation plasticity model has been developed in an attempt to study the load shedding phenomenon under dwell loading conditions. The phase boundary energy barrier for dislocation transmission has been calculated by fitting the strain field of crystal plasticity modelling and experiment micro-pillar compression. The energy is then utilised to a thermally-activated discrete dislocation plasticity model which incorporating slip transfer across grain boundary to study the effect of grain boundaries in Ti-6242 alloy. It has been shown that the stress distribution through the soft-hard grain combination, which is argued to be crucial in the facet crack nucleation, increased significantly during the stress hold period. The load shedding phenomenon does not diminish when slip penetration is permitted and the key mechanism with respect to load shedding in titanium alloys is the time constant associated with the process of thermally activated dislocation escape; the dislocation-grain boundary penetration only plays a secondary effect.
||Planned: Supplemental Proceedings volume