Nondestructive evaluation of the characteristics of degraded materials using backward radiated ultrasound |
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| Authors: | Sung D Kwon Sung J Song Dong H Bae Young Z Lee |
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| Affiliation: | (1) Department of Physics, Andong National University, 388 Songchundong, Andong, 760-749 Kyungbuk, Korea;(2) School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchundong, Suwon, 440-746 Kyunggi-do, Korea |
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| Abstract: | The frequency dependency of Rayleigh surface wave is investigated indirectly by measuring the angular dependency of the backward
radiation of the incident ultrasonic wave in two kinds of degraded specimens by scuffing or corrosion. Then, the frequency
dependency is compared with the residual stress distribution or the corrosion-fatigue characteristics for the scuffed or corroded
specimens, respectively. The width of the backward radiation profile increases with the increase of the variation in residual
stress distribution for the scuffed specimens. In the corroded specimens, the profile width decreases with the increase of
the effective aging layer thickness and is inversely proportional to the exponent, m, in the Paris’ law that can predict the
crack size increase due to fatigue. The result observed in this study demonstrates high potential of backward radiated ultrasound
as a tool for nondestructive evaluation of subsurface gradient of material degradation generated by scuffing or corrosion. |
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| Keywords: | Backward Radiated Ultrasound Residual Stress Distribution Corrosion Fatigue Characteristic Scuffing Crack Growth rate Nondestructive Evaluation |
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