|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Coupling Experiments and Modeling to Understand Plasticity and Failure
||Integrated Micromechanical Approaches to Understand Dwell Fatigue: Crystal and Discrete Dislocation Plasticity Modelling
||Fionn Dunne, Ben Britton, Zebang Zheng, Daniel Balint, Zhen Zhang
|On-Site Speaker (Planned)
Crystal and discrete dislocation plasticity modelling methods have been established through integration with micro-pillar testing (previous talk) to address the mechanistic basis of load shedding and dwell fatigue in polycrystalline Ti alloys. Crystal plasticity modelling is utilised to extract slip strengths and energy barriers for thermally activated dislocation escape, which controls rate sensitivity, for both and alpha and beta phases, and provides persuasive agreement with experimental micro-pillar local and average behaviour. The properties are utilised in a recently developed thermally activated discrete dislocation model to assess load shedding in two Ti alloys which do and do not show dwell fatigue respectively. Temperature and microstructure sensitivity of dwell fatigue are assessed in representative two-phase Ti alloys for which the roles of beta-laths and alpha-variants in dwell fatigue are assessed.
||Planned: Supplemental Proceedings volume