Proto Residual Stress Analysis
Residual stress is defined as “the stress resident inside a component or structure after all applied forces have been removed”.
Importance of Residual Stress
Residual stress affects:
- Low cycle and high cycle fatigue performance
- Peen forming (controlled distortion)
- Stress corrosion cracking (SCC) and hydrogen initiated cracking (HIC)
- Crack initiation and propagation. (Damage tolerance)
- Residual Stress distribution is rarely as assumed in FE models and or fracture mechanics; real data is necessary to improve the accuracy and effectiveness of the modeling.
The Benefits of Measuring and Monitoring Residual Stresses
- Optimize process parameters, such as measuring the effectiveness of peening on a part at critical locations.
- Provide a quantitative metric to enable specifications and Go/No-Go decisions.
- Improve product quality, substantiate supplier quality, engineering source approval (ESA)
- Improve safety and reduce catastrophic failures.
- Extend component or structure life by ensuring sufficient compressive residual stress is present.
- Validate repair area has been “restored” to original specifications.
- More accurate replacement part requirements by tracking residual stress degradation; thus, enabling retirement for quantitative cause.
- Residual stress information can improve the probability of detection of other nondestructive techniques.
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