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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.12 (2008)  >  pp.1191-1197

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.12 (2008)   pp.1191 - 1197 Next article>>

Monte Carlo Simulation of Stress Corrosion Cracking on Smooth Surface under Non-Uniform Stress Condition

Hiromitsu SUZUKI1), Keiichiro TOHGO2), Yoshinobu SHIMAMURA2), Guen NAKAYAMA3) and Takashi HIRANO3)
1) Shizuoka Univ.
2) Shizuoka Univ.
3) IHI Corporation


A Monte Carlo simulation model for the process of stress corrosion cracking (SCC) in structural metal materials under non-uniform stress condition has been proposed. The possible number of crack initiations is set for a given space and initiation times for all cracks are assigned by random numbers based on exponential distributions depending on stress level. Sites and lengths of the cracks are assigned by random numbers based on uniform distribution and normal distribution, respectively. Coalescence of cracks and subcritical crack growth are determined based on the fracture mechanics concept. Through the SCC process in the model, the influence of semi-elliptical surface cracks is taken into consideration. SCC simulations were carried out on a smooth surface under two kinds of non-uniform stress conditions such as residual stress distribution around a weld line. Multiple parallel cracks and multiple cracks along narrow high stress region were obtained depending on the stress distributions, respectively. Simulation results exhibit the applicability of the model to describe the SCC behavior observed in real structures.


Keyword:
Stress corrosion cracking, Monte Carlo simulation, Crack initiation, Crack coalescence, Subcritical crack growth, Surface crack, Non-uniform stress condition

Received: April 17, 2008
Published online: December 19, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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