About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components III
|
Presentation Title |
The Role of Stress-State on the Failure Mechanism, Strain to Failure and Fatigue Resistance of Zircaloy-4 |
Author(s) |
Brian V. Cockeram, Kwai Chan, Bruce Kammenzind |
On-Site Speaker (Planned) |
Brian V. Cockeram |
Abstract Scope |
The strain to failure for Zircaloy-4 under monotonic loading and cyclic loading is affected by stress-state, hydrogen, and temperature. Stress-state, which can be considered a measure of constraint, was quantified using triaxiality, which is defined as the ratio of hydrostatic stress to von Mises stress. The increase in triaxiality from 0.33 for smooth tensile specimens to 0.9 for notched specimens, along with the presence of hydrides, produces a decrease in both the strain to failure and fatigue resistance. An increase in strain to failure and fatigue resistance is observed at lower values of zero triaxiality under shear loading with larger increases observed in compression. Hydrogen is shown to have a relatively small effect on the results for specimens with low triaxiality values. In-situ and ex-situ testing of notched Zircaloy-4 specimens with varying levels of hydrogen and stress state was performed, and these results are used to show this behavior is the result of the change in the mechanisms for deformation and fracture. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nuclear Materials, Other |