About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Mechanistic Model for Hydrogen Accelerated Fatigue Crack Growth in a Low Carbon Steel |
Author(s) |
Mohsen Dadfarnia, Zahra Hosseini, Masanobu Kubota, Akihide Nagao, Brian P. Somerday, Petros Sofronis, Robert O. Ritchie |
On-Site Speaker (Planned) |
Mohsen Dadfarnia |
Abstract Scope |
Fatigue crack growth in the presence of hydrogen is a severe mode of environmental failure. Although this failure mode has been the subject of intense investigation over several decades, a mechanistic model is still lacking. In this study, we present a model for fatigue crack propagation induced by alternating crack tip plastic blunting and re-sharpening and in which crack growth is governed solely by the plastic dissipation ahead of the propagating crack. The Chaboche constitutive model is used for the calculation of the stress and strain fields. The model is calibrated using a sequence of experimental data from uniaxial strain-controlled cyclic loading tests and uniaxial stress-controlled ratcheting tests of a low carbon steel, JIS SM490YB, in the absence and presence of hydrogen. The numerical simulation results indicate that the proposed crack propagation model can predict Paris law behavior in the absence and presence of hydrogen. |
Proceedings Inclusion? |
Planned: |