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Feasibility Study on Diagnosis of Material Damage Using Bulk Wave Mixing Technique

체적파 혼합기법을 이용한 재료 손상 진단 적용 가능성 연구

  • 최정석 (부산대학교 대학원 기계시스템설계) ;
  • 조윤호 (부산대학교 기계공학부)
  • Received : 2016.01.12
  • Accepted : 2016.02.23
  • Published : 2016.02.28

Abstract

Ultrasonic nonlinear evaluation is generally utilized for detection of not only defects but also microdamage such as corrosion and plastic deformation. Nonlinearity is determined by the amplitude ratio of primary wave second harmonic wave, and the results of its comparison are used for evaluation. Owing to the experimental features, the experimental nonlinearity result contains system nonlinearity and material nonlinearity. System nonlinearity is that which is unwanted by the user; hence, it acts as an error and interrupts analysis. In this study, a bulk wave mixing technique is implemented in order to minimize the system nonlinearity and obtain the reliable analysis results. The biggest advantage of this technique is that experimental nonlinearity contains less system nonlinearity than that for the conventional nonlinear ultrasonic technique. Theoretical and experimental verifications are performed in this study. By comparing the results of the bulk wave mixing technique with those of the conventional technique, the strengths, weaknesses, and application validity of the bulk wave mixing technique are determined.

Acknowledgement

Supported by : 부산대학교

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