About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Sensitivity of Fatigue Crack Growth Lives to Sustained Thermal Gradients |
Author(s) |
James Sobotka, Robert Craig McClung, Michael P Enright |
On-Site Speaker (Planned) |
James Sobotka |
Abstract Scope |
This presentation focuses on cracks advancing through sustained thermal gradients. Cyclic crack growth and time-dependent crack growth have been set to capture the response of the high-temperature alloy ME3. This presentation investigates the effect of peak temperature, peak stress, temperature gradient, hold time, and time to reach full loading. To perform this investigation, we design a simple example problem that captures key features of fatigue crack growth without introducing unnecessary complexity. Results indicate that increasing lives are associated with decreasing thermal gradients due to the reduction in crack growth per cycle. Furthermore, these results reveal significant increases in lives are expected for cracks with appreciable time-dependent crack growth. Designers may employ these ideas to extend useful lives of applications with strong spatial gradients in the material response, e.g., recent efforts to design internal cooling passages into gas-turbine engines using additive manufacturing. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, High-Temperature Materials, |