The Crack Growth Evaluation of A335 P22 Steels by Acoustic Emission

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Acoustic emission (AE) technique was used to investigate fatigue crack growth on compact tension specimens of aging materials at room temperature. Test materials have been sampled steam pipe serviced the actual operation conditions for a long time in fossil power plant. The compact tension test specimens were subjected to load stress ratios of 0.33, 0.5, and 0.66. All the fatigue tests were performed at a frequency of 1Hz. The test results indicate that acoustic emission counts show reasonable correlation with crack propagation rates for applied stress ratios. When the crack growth rates increase, AE’s counts and energies show increment. Also, the higher stress ratios, the faster crack propagation rates. Based on these relationships it may be possible to predict the remaining service life of fatigue-damaged steam pipes.

Info:

Periodical:

Key Engineering Materials (Volumes 297-300)

Edited by:

Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim

Pages:

2083-2089

Citation:

G. W. Song et al., "The Crack Growth Evaluation of A335 P22 Steels by Acoustic Emission ", Key Engineering Materials, Vols. 297-300, pp. 2083-2089, 2005

Online since:

November 2005

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$38.00

[1] T.M. Roberts and M. talebzzad: Acoustic Emission Monitoring of Fatigue Crack Propagation, , Journal of Constructional Steel Research Vol. 59 (2003), pp.695-712.

DOI: https://doi.org/10.1016/s0143-974x(02)00064-0

[2] John M. Rodgers, Bryan C. Morgan and Richard Tilly: Acoustic Emission Monitoring for Inspection of Seam Welded Hot Reheat Piping in Fossil Power Plants, SPIE Conference on Nondestructive Evaluation Techniques for Aging Infrastructure & Manufacturing Vol. 2947 (1996).

DOI: https://doi.org/10.1117/12.259159

[3] ASTM E647-99, Standard Test Method for Measurement of Fatigue Crack Growth Rates.

[4] B. Tomkins: Fatigue; Introduction and Phenomenology, in Creep and Fatigue in High Temperature Alloys, Applied Science Publishers (1981), pp.73-113.

[5] J.C. Spanner, Ed., Monitoring Structure Integrity by Acoustic Emission, ASTM STP 571, American Society for Testing and (Materials 1975).

[6] Bryan C. Morgan and Richard Tilly: Acoustic Emission Monitoring for Inspection of Power Plant Headers Utilizing Acoustic Emission Monitoring, NDT&E International Vol, 32 (1999), pp.167-175.

DOI: https://doi.org/10.1016/s0963-8695(98)00068-1