Monte Carlo Simulation of Stress Corrosion Cracking in Structural Metal Materials

Abstract:

According to laboratory accelerated test data, stress corrosion cracking (SCC) in structural metal materials occurs by initiation and coalescence of micro cracks, subcritical crack growth, multiple large crack formation and final failure under the combination of materials, stress and corrosive environment. In this paper, a computer simulation model for the process of SCC has been proposed. The procedure is as follows: The possible number of crack initiations is set for a given space and the initiation times for all cracks are assigned by random numbers based on exponential distribution. The sites and length of the cracks are assigned by uniform random numbers and normal random numbers, respectively. The coalescence of cracks and the subcritical crack growth are determined based on the fracture mechanics. The simulation is terminated when the maximum crack length reaches a critical value or all of the possible number of cracks is initiated. The results obtained in this paper indicate the applicability of the present model to predict the SCC behavior in real structures based on the laboratory accelerated test data.

• Periodical: Key Engineering Materials (Volumes 306-308)
• Pages: 447-452
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.306-308.447
• Online since: March 2006
• Authors: Keiichiro Tohgo, Nobuhiro Ogai
• Keywords: Crack Coalescence, Crack Initiation, Monte-Carlo Simulation, Stress Corrosion Cracking (SCC), Sub Critical Crack Growth

References

[1] R.N. Parkins, Proc. Int. Sympo. Plant Aging and Life Predictions of Corrodible Structures, T. Shoji and T. Shibata, Eds., JSCE-NACE International, (1997), p.1.

[2] M. Akashi and G. Nakayama, Proc. Int. Symp. on Plant Aging and Life Prediction of Corrodible Structures, T. Shoji and T. Shibata, Eds., JSCE-NACE International, (1997), p.99.

[3] K. Nakanishi, Y. Tanaka, K. Yoshida and M. Akashi, Proc. Int. Symp. on Plant Aging and Life Prediction of Corrodible Structures, T. Shoji and T. Shibata, Eds., JSCE-NACE International, (1997), p.691.

[4] K. Saito and J. Kuniya, Corrosion Science, Vol. 43, (2001), p.1751.

[5] Y-Z. Wang, D. Hardie and R.N. Parkins, Corrosion Science, Vol. 37, (1995), p.1705.

[6] H. Kitagawa and Y. Nakasone, J. Soc. Mater. Sci. Japan, Vol. 33, No. 364, (1983), p.14 (in Japanese).

[7] Y. Nakasone and T. Miyama, ASME, PVP-Vol. 365, (1998), p.131.

[8] H. Kitagawa, T. Fujita and K. Miyazawa, ASTM STP 642, (1978), p.98.