| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Application of Local Strain Theory for Predicting Notch Fatigue Testing in Hydrogen-Charged Austenitic Stainless Steel |
| Author(s) |
Debjit Misra, Kevin Nibur, Brian Somerday, Zachary Harris |
| On-Site Speaker (Planned) |
Debjit Misra |
| Abstract Scope |
Austenitic stainless steels are well-known for their good performance in hydrogen gas, but due to experimental simplicity, fatigue life measurements for these materials are often performed using precharged, notched specimens. Unfortunately, current fitness for service frameworks do not provide a pathway for transferring such notched fatigue data for use in component design analysis. In the current study, the local strain theory is employed to predict the notch fatigue behavior of hydrogen-charged 21Cr-6Ni-9Mn stainless steel. Smooth bar fatigue experiments are performed to obtain the cyclic stress-strain curve for this material-environment combination, which is utilized to calculate the local strains present at the root of the notched specimens. Fatigue life predictions based on these local strains are found to be in good agreement with experimental measurements performed on notched 21Cr-6Ni-9Mn specimens precharged with hydrogen, suggesting that the local strain theory may provide an avenue to enable the transferability of notched fatigue data. |