The paper performs a prospective study by means of probabilistic approach of thermal fatigue crack growth which is a known damaging mechanism in mixing tees of nuclear piping. The approach uses an appropriate limit state function defined for failure and Monte Carlo
simulation as a tool for lifetime evaluation. Based on previous works, where a deterministic assessment for thermal fatigue crack growth in high-cycle loadings has been done, the large nonlinear gradient stress profiles through the pipe wall-thickness under sinusoidal thermal
loading are accounted for. The probabilistic approach considers variability in initial crack depth and Paris law C scaling parameters by means of specific probability density functions. The results were applied to a specific damage case and the log-normal distribution has been found to best fit the fatigue lifetimes.
RADU Vasile;
PAFFUMI Elena;
NILSSON Karl-Fredrik;
2011-08-04
INR Institute for Nuclear Research
JRC64966
2247-191X,
http://www.jnrd-nuclear.ro/No.1/JNRD_No1_paper01.pdf,
https://publications.jrc.ec.europa.eu/repository/handle/JRC64966,
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