| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Mechanistic Model for Fatigue Crack Growth in the Presence of Hydrogen |
| Author(s) |
Seyedehzahra Hosseinisarani, Mohsen Dadfarnia, Masanobu Kubota, Akihide Nagao, Brian P. Somerday, Petros Sofronis, Robert O. Ritchie |
| On-Site Speaker (Planned) |
Seyedehzahra Hosseinisarani |
| Abstract Scope |
Hydrogen accelerated fatigue crack growth is a severe mode of environmental failure for which a mechanistic model is still lacking. In this study, we attempt to theoretically model fatigue crack propagation induced by alternating crack tip plastic blunting and re-sharpening. The model which is so designed that it relies on inputs from experiments that measure macroscopic material behavior such as the uniaxial cyclic straining can successfully reproduce the response in the Paris regime. The model is used to investigate the dependence of fatigue crack growth on the hydrostatic constraint. Lastly, we explore the hydrogen effect on crack propagation under equilibrium conditions of hydrogen with material straining. The hydrogen effect is accounted for through the modification of the hardening response of the material according to the experimentally observed acceleration of the motion and generation of dislocations. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |