Piping and pressure vessels are on occasion subjected to overload that may affect their ability to perform the role for which they were designed. A combination of velocity change and frequency analysis for near surface longitudinal (LCR) waves is used to evaluate load damage past the yield point in 4140 steel. Prior work has shown that loading past the yield point affects the velocity in the bar. Further, frequency analysis has been shown to predict the fracture toughness in AISI 4137 steel used in offshore drilling. The present project joins these two approaches and uses velocity measurement and frequency analysis at different locations in the steel bar. Some locations were subjected to post-yield loading and others were not. Discussion on applying the technique to detecting hydrogen attack is included.

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