A Study on the Correlations Between Ultrasonic Parameters and Fracture Toughness

초음파 파라미터와 파괴인성치의 상관관계에 관한 연구

  • 김정표 (삼성전기 DM사업부) ;
  • 박재실 (성균관대학교 산업설비안전성평가연구센터) ;
  • 배봉국 (성균관대학교 기계공학부) ;
  • 석창성 (성균관대학교 기계공학부)
  • Published : 2005.02.01


In this study the four classes of the thermally aged 1Cr-1Mo-0.25V specimens were prepared using an artificially accelerated aging method. Ultrasonic tests were performed to get the correlation with fracture toughness. The modified theoretical Vary's equation, considering nonlinear response due to material degradation, was proposed for the correlations between ultrasonic parameters and fracture toughness. Experimental results indicate that ultrasonic attenuation coefficient, velocity and nonlinear parameters produce the correlations with fracture toughness and yield strength.


Ultrasonic Parameter;Fracture Toughness;Non-linear Parameter;Attenuation Coefficient


  1. Vary, A., 1978, 'Correlations among Ultrasonic Propagation Factors and Fracture Toughness Properties of Metallic Materials,' Material Evaluation, Vol. 36, pp. 55-64
  2. Kolsky, H. and Rader, D., 1971, 'Facture,' Liebowitz. H., Ed., Vol. 1, Academic Press, New York, pp. 533-569
  3. Yamano, M., Ichikawa, M., Okuno, M., Suzuku, N. and Iizuka, Y., 1996, 'Nondestructive Measurement of Grain Size in Steel Plate by Ultrasonic Attenuation,' Materials Science Forum Vols. 210-213, pp. 759-766
  4. Kline, Ronald A., 1984, 'Measurement of Attenuation and Dispersion using an Ultrasonic Spectroscopy Technique,' J. Acoust. Soc. Am., 76(2), pp. 489-504
  5. Sachse Wolfgang and Pao Yih-Hsing, 1978, 'On the determination of phase and group velocities of dispersive waves in solids,' J. Appl. Phys., Vol. 49, pp. 4320-4327
  6. Kim Kyung-Cho, Jhang Kyung-Young and Hisashi Yarnawaki, 2001, 'The Evaluation of Partially degraded Material Using Nonlinear Propagation Characteristics of Ultrasonic Wave,' Trans. of KSME. A, Vol. 26, No.2, pp. 214-219
  7. Jeong, H., Nahm, Jhang, K.Y. and Nam, Y.H., 2002, 'Evaluation of Fracture Toughness Degradaton of CrMoV Rotor Steels Based on Ultrasonic Nonlinearity Measurements,' J. of KSME Int., Vol. 16, No.2, pp. 147-154
  8. Breazeale, M. A. and Ford, J., 1998, 'Acoustic Source Book,' McGraw-Hill, pp. 57-68
  9. Kim, J.P. and Seok, C.S., 2001, 'A study on the Evaluation of Material Degradation of 1Cr-1Mo-0.25V Steel using Ultrasonic Techniques,' Trans. of KSME A, Vol. 25, No. 12, pp. 2116-2124
  10. Anderson. T. L., 1995, 'Fracture Mechanics,' CRC Press. pp. 13-127
  11. Yoon Kee-Bong, Yoon, S.H., Kim, ST., Nahm, Seung-Hoon and Suh, Chang-Min, 1994, 'Evaluation of JIe and Tmal of Aged 1Cr-1MO-0.25V Steel at Elevated Temperature,' Trans. of KSME, Vol. 18, No. 011, pp.2860-2870