|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Building an ICME Infrastructure: Developing Tools that Integrate Across Length and Time Scales to Accelerate Materials Design
||Coupled Crystal Plasticity-phase Field Method to Model Crack Initiation and Propagation in Ti64 Alloys
||Jiahao Cheng, Somnath Ghosh
|On-Site Speaker (Planned)
Crack initiation and propagation in highly heterogeneous titanium alloys at polycrystal scale are essential for aerospace applications. However, simulations of cracking in polycrystalline-microstructures require modeling complex crack topologies, e.g. crack deflection at grain boundaries, branching, and interactions with slip bands. In this work, a coupled crystal-plasticity-phase field approach is developed to overcome the difficulties. The method introduces a continuous auxiliary global field to approximate the sharp crack discontinuity. Without ad-hoc numerical additions, the crack phase field regularizes sharp crack surfaces by forming a crack surface area density functional, and augmented the Helmholtz free energy to describe the fracture process. The crack propagation rate and direction are then the natural outcomes from thermodynamics analysis and the principle of virtual power. Furthermore, a projection-based numerical method between the mechanical/phase fields enhances this approach to alleviate the high-resolution discretization demand from conventional phase field formulation.
||Planned: Supplemental Proceedings volume