Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Nondestructive Evaluation of the Characteristics of Degraded Materials Using Backward Radiated Ultrasound

  • Sung D. Kwon (Department of Physics, Andong National University) ;
  • Sung J. Song (School of Mechanical Engineering, Sungkyunkwa University) ;
  • Dong H. Bae (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Lee, Young Z. (School of Mechanical Engineering, Sungkyunkwan University)
  • Published : 2002.09.01
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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.

Keywords

References

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