|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Prediction of Intergranular Micro-crack Initiation Induced by the Impingement of Persistent Slip Bands on Grain Boundaries
||Jerome Hazan, Maxime Sauzay
|On-Site Speaker (Planned)
PSB-GB micro-crack initiation is a major issue in the understanding of damage mechanisms and prediction of the lifetime of ductile metals subjected to low cycle fatigue. This phenomenon is modelled through finite element simulations of the cyclic deformation of small aggregates of various fcc metals and alloys. The calculations account for (i) cubic elasticity and plasticity, (ii) slip localization in PSBs and (iii) production, annihilation of vacancies within PSBs and their diffusion toward the surrounding matrix, inducing a free dilatation increasing cycle by cycle. We predicted GB deformations and stress fields induced by the impingement of PSBs on the neighboring GBs. The influence of grain size and of the crystallographic orientation of the neighbor grain is estimated. Then, by adding a Cohesive Zone Model (based on atomistic consideration) at the PSB-GB interface, the number of cycles to initiate GB micro-cracks are predicted. The results are finally compared to experimental observations.
||Planned: Supplemental Proceedings volume