Material Characterization of Lock Plate Using Guided Wave

유도 초음파를 이용한 락 플레이트 물성 평가

  • 이재선 (부산대학교 대학원 기계공학부) ;
  • 조윤호 (부산대학교 기계공학부) ;
  • 정경식 (부산대학교 대학원 기계공학부)
  • Published : 2009.04.01


Presented in this paper is a new experimental technique to measure material properties of lock plate of gas turbine plants by using ultrasonic guided wave. In comparison with the mechanical destructive testings, material characterization of the Inconel x-750 was nondestructively carried out in a more efficient manner to discriminate the change in elastic moduli and the poisson's ratio attributed to the variation of heat treatment condition. The proposed technique shows a satisfactory feasibility via the comparative experiments with the imported lock plate specimens. It is also expected that the guided wave technique can cover a longer and wider range as a new cost-&-time-saving inspection tool due to the interaction with a greater part of specimen, compared to a conventional local point-by-point scheme.


Guided Wave;Inconel x-750;Dispersion Curve


  1. Jung, H., 1991, 'A Study in Measurement of Thermal Aging in High Temperature Facility,' Journal of the KSME, Vol. 37, No. 11, pp.251-260
  2. Hur, S. K., Hong, K. T. and Do, J. M., 1988, 'The Measurement of Degradation in Creep-Ruptured Cr-Mo-V Steels by NDE Methods,' Proc. of the 2nd Conference on Mechanical Behaviors of Materials, Seoul, Korea, pp. 17-24
  3. Viswanathan, R. and Bruemmer, S. M., 1985, 'In-Service Degradation of Toughness of Steam Turbine Rotors,' Transactions of the ASME, Vol. 107, pp. 316-324
  4. Rose, J. L., Rajana, K. M. and Carr, F. T., 1994, 'Ultrasonic Guided Wave Inspection Concepts for Steam Generator Tubing,' Material Evaluation, Vol. 52, pp. 307-311
  5. Cho, Y. and Rose, J. L., 1996, 'Guided waves in a Water Loaded Hollow Cylinder,' Nondestructive Testing and Evaluation, Vol. 12, pp. 323-339
  6. Cho, Y., 1995, 'Defect Detection and Characterization Potential with Guided Waves,' Ph. D. Dissertation, The Pennsylvania State Universit
  7. Younho Cho, J. L Rose, 1996, 'The Study on mode Characteristic of Ultrasonic Guided wave for a Large Structure NDE,' A proceeding of korean Nondestructive Testing, pp. 93-101
  8. Rose, J. L., 1999, Ultrasonic Waves in Solid Media, Cambridge
  9. Younho Cho, 2001, 'Understanding and Application of Ultrasonic Guided Waves,' Journal of korean Nondestructive Testing, Vol. 21, pp. 446-463
  10. Lamb H, 1917, 'On waves in an elastic plate. Proc. Soc,' PT series A. pp. 114-128
  11. Yamashita, M., Viswanathan, U. K., Yamamoto, I. and Kobayashi, T., 1997, 'Service-induced Changes in the Microstructure and Mechanical Properties of a Cr-Mo-Ni-V Turbine Steel,' ISIJ International, Vol. 37, No. 11, pp. 1133-1138