About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
A Unified Fracture Criterion in Consideration of Hydrogen Effect in Martensitic Steel Sheet |
Author(s) |
Geonjin Shin, Hyejin Kim, Chanyang Kim, Kijeong Kim, Seungchae Yoon, Myoung-Gyu Lee |
On-Site Speaker (Planned) |
Geonjin Shin |
Abstract Scope |
In this study, the effect of hydrogen on the mechanical behavior of fully martensitic steel is investigated. The slow strain rate test is conducted for the hydrogen-charged samples. Also, a finite element model is developed to simulate the hydrogen transport in the samples. Then, a new fracture criterion is proposed by considering the effect of hydrogen on the martensitic steel. The experiments show that the plastic hardening of the martensitic steel is lowered, and fracture behavior changes from ductile to brittle as the hydrogen concentration increases. To model the hydrogen effect on mechanical and failure behavior, a sigmoidal softening law is suggested to represent hydrogen-assisted plasticity. Furthermore, a unified fracture model combining the strain-based, and stress-based fracture criteria is proposed as a function of stress triaxiality, lode angle parameter, and hydrogen concentration. The unified fracture criterion can successfully predict the fracture behavior under various stress states and hydrogen conditions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Mechanical Properties, Modeling and Simulation |