The fatigue life of carbon and low alloy steels decreases with reduction in strain rate in high temperature water such as in the case of a light water reactor coolant. The fatigue life reduction also depends on temperature and dissolved oxygen. The fatigue life correction factor has been proposed as a method to assess the fatigue life reduction in such environments. Three different models for calculating for carbon and low alloy steels have been proposed by Higuchi et al., Chopra et al., and Mehta. These models were compared using considerable environmental fatigue data that were tested and published in Japan and USA and piled up in the database “JNUFAD” by the author. These models give somewhat different results in the specific conditions and a revised model for calculating is thus proposed by remedying the particular drawbacks of each. In this model, the same formula is used for carbon and low alloy steels and and are adopted in the formula after reevaluating every parameter. The revised proposal shows better correlation with the test data than the previous models.
Revised Proposal of Fatigue Life Correction Factor Fen for Carbon and Low Alloy Steels in LWR Water Environments
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division April 18, 2003; revision received April 26, 2004. Associate Editor: S. Rahman.
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Higuchi, M. (December 1, 2004). "Revised Proposal of Fatigue Life Correction Factor Fen for Carbon and Low Alloy Steels in LWR Water Environments ." ASME. J. Pressure Vessel Technol. November 2004; 126(4): 438–444. https://doi.org/10.1115/1.1767860
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