| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Investigation of Residual Stress Using High Resolution XRD and Localized Lattice Rotation Under Fatigue Loading
|
| Author(s) |
Ramasis Goswami |
| On-Site Speaker (Planned) |
Ramasis Goswami |
| Abstract Scope |
The characteristics of plastic zone are crucial for understanding the underlying physics of the deformation process and the generation of residual stress around a crack tip under fatigue loading. A significant change in residual stress around a fatigue crack has been observed in Al alloys. For Al 7075, the residual stress increases by 200% closer to the crack. However, in Al 1100, the residual stress decreases by 80% closer to the crack. The dislocation density increases by 25 to 30 % for Al 7075. However, it actually decreases by 10% for Al 1100. Such change in dislocation density cannot explain the observed change in residual stress closer to the crack. We conclude that the deformation associated with the lattice rotation would be a major contributing factor to the residual stress. This provides a new insight on the role of lattice rotation on the residual stress under fatigue loading.
|
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |