| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Correlation between Cyclic Plastic Deformations and Strength Mismatches in Ni-Steel Dissimilar Joints under Isothermal Low-cycle Fatigue Tests |
| Author(s) |
Shutong Zhang, Sebastian Romo, Rafael Arthur Giorjao, Antonio Ramirez |
| On-Site Speaker (Planned) |
Shutong Zhang |
| Abstract Scope |
Welding repairs technologies have been widely adopted to restore the damages of large pressure vessels like coke drums that endure severe cyclic loading conditions. However, due to the intrinsic mismatching strengths and microstructures, the fatigue life of dissimilar repair joints is significantly compromised by the concentrations of plastic deformations at susceptible regions. Correlating plastic deformations with localized strength mismatches and constraining effect can contribute to the accurate prediction of susceptible regions and fatigue life of the joints. In this study, the low-cycle fatigue behaviors of Ni-Steel dissimilar joints are evaluated using digital image correlation (DIC), which is an in-situ technique to characterize the strain distributions in mesoscale level. Local strength mismatches at weld transition characterized by micro-hardness indentations are correlated with plastic deformations analysis. Energy-base criteria is further proposed to predict the fatigue life of stress-concentrated areas and hence to predict the fatigue life of joints. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Joining, Mechanical Properties, Modeling and Simulation |