|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Dislocation Patterns under Cyclic Loading in Multiple Slip
||Shengxu Xia, Anter El-Azab
|On-Site Speaker (Planned)
We report on the prediction of the dislocation patterns in FCC crystals under cyclic loading using continuum dislocation dynamics theory. In this density-based framework, the dislocation density evolution is governed by the rates of transport, cross slip and reactions, which are captured by kinetic equations derived based on statistical mechanics principles. Novel finite element method has been used to solve the dislocation kinetic equations coupled with crystal mechanics. Within this framework, the cross slip process and dislocation-dislocation reactions at short range are treated using a Monte Carlo approach in the continuum frame. Simulation results for the cyclic stress-train curve, the average dislocation density evolution, and emerging dislocation and slip patterns will be presented. Preliminary results demonstrate crystal hardening and saturation, which is known to occur in experiments. A special attention is given to the analysis of the observed dislocation and comparison with TEM observation in the literature.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)