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
  • Distortion
  • Peen forming (controlled distortion)
  • Fretting
  • 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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