| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Two-way Coupled Microstructure-sensitive Crystal Plasticity and Hydrogen Diffusion Near a Blunted Crack-tip for FCC Metals |
| Author(s) |
Tang Gu, Gustavo M. Castelluccio, Ting Zhu, David L. McDowell |
| On-Site Speaker (Planned) |
Tang Gu |
| Abstract Scope |
Microstructure-Sensitive Crystal Plasticity (MS-CP) modeling accounts for evolution of mesoscale dislocation substructures using a set of dislocation-based parameters that can be informed via experiments and computation at various lower length scales. MS-CP model parameters are affected by hydrogen (H) concentration, accounting for both H-enhanced initial yield strength and H-reduced rate of strain hardening. In this work, H-affected MS-CP model is two-way coupled with H-diffusion to explore (i) effects of plastic deformation on H-diffusion and (ii) effects of H on strength and strain hardening. Crack tip simulations are performed for FCC metals under monotonic loading conditions with and without H. Increased localization of plastic strain and dislocation density are predicted near the crack tip in the presence of H, consistent with experimental observations. In contrast, H-enhanced initial strengthening inhibits localization of crack tip plastic deformation, demonstrating the dominant role of the reduced rate of strain hardening in modeling effects of H. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |