A Study on the Nondestructive Evaluation of Material Degradation

Abstract:

Article Preview

The mechanical properties of in-service facilities under harsh environment a decrease as materials of the facilities degrade. This decrease of mechanical properties can affect the safety operation of the facilities. Therefore, the extent of degradation due to prolonged service exposure must be estimated. Nondestructive evaluation method is a good technique for monitoring the change of mechanical properties of in-service facilities. The most widely used nondestructive methods are the ultrasonic method and the indentation test, which is advantageous with respect of applicability to in-service facilities. The modified theoretical Vary's equation, considering nonlinear response due to material degradation, was proposed for obtaining the correlations between ultrasonic parameters and fracture toughness. Experimental results showed that ultrasonic attenuation, velocity, and nonlinear parameters have significant correlation with fracture toughness and yield strength. The nondestructive evaluation system can be used to obtain the yield strength and ultrasonic parameters simultaneously, and this information can be used to predict the fracture toughness. The predicted results produced good correlations with the experimental results, indicating that the nondestructive evaluation system can be effective in evaluating material properties and degradation, and the life time of facilities.

Info:

Periodical:

Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim

Pages:

685-688

DOI:

10.4028/www.scientific.net/KEM.326-328.685

Citation:

H. I. Kim et al., "A Study on the Nondestructive Evaluation of Material Degradation", Key Engineering Materials, Vols. 326-328, pp. 685-688, 2006

Online since:

December 2006

Export:

Price:

$35.00

[1] C. S. Seok, H. I. Kim: Key Engineering Materials, Vol. 297-300 (2005), p.2465.

[2] D. Tabor: The Hardness of Metals (Oxford University Press, New York 1951).

[3] F. M. Haggag: ASTM STP 1204 (1993), p.27.

[4] Pollard, H. F.: Sound Waves in Solids (Pion, London 1997), p.23.

[5] Hurley, D. C., Balzar, D., Purtscher, P. T.: J. of Applied Physics, Vol. 83 (1998), p.4584.

[6] Vary A: Materials Evaluation, Vol. 36 (1978), p.55.

[7] J. P. Kim, C. S. Seok: Proceedings of the KSME 2002 Spring Annual Meeting, p.269.

[8] A.M. Abdel-Latif, S.M. Corbett, D.M.R. Taplin: Met. Sci., Vol. 16 (1982), p.90.

[9] Dieter, G. E.: Mechanical Metallurgy (McGraw-Hill 1986), p.72.

In order to see related information, you need to Login.