| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Crystal Plasticity Modeling of Hydrogen Concentration Ahead of a Crack Tip in FCC Steel |
| Author(s) |
Theodore Zirkle, Tang Gu, Ben Anglin, Clint Geller, David L. McDowell |
| On-Site Speaker (Planned) |
Theodore Zirkle |
| Abstract Scope |
The effect of hydrogen on deformation, fracture, and fatigue of metals has been a long standing issue with numerous historical mechanisms proposed. General agreement on the mechanism for hydrogen embrittlement, however, remains elusive. Of specific interest in the fatigue of materials is the experimentally observed tendency of hydrogen to cluster around a crack tip. To study this phenomenon, we employ a coupled diffusion-crystal plasticity model to extend the Sofronis-McMeeking hydrogen transport model to the continuum level in order to simulate the heterogeneous distribution of hydrogen ahead of a crack tip. FCC steel material behavior and hydrogen diffusion are modeled using a User Material Subroutine and User Material Heat Equation Subroutine in the finite element package ABAQUS. We discuss the implications of the model results and propose paths forward to leverage the continuum level understanding of heterogeneous hydrogen concentrations to inform new constitutive equations in the study of hydrogen embrittlement. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |