An Estimation Method of Long-Term Corrosion Fatigue Crack Growth Characteristics

概要

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An estimation method of long-term growth characteristics of corrosion fatigue (CF) cracks using laboratory data is proposed based upon a linear summation model in terms of modified effective stress intensity factor range, ΔK_<cont>, which eliminates the corrosion products-induced wedge effect. Long-term CF crack growth curves of a 50 kgf/mm^2 high-tensile strength steel, HT50 and HT50-TMCP, and a 80kgf/mm^2 one, HT80, in synthetic seawater are estimated supposing that ΔK_<cont> is identical to the nominal stress intensity factor range, ΔK. The threshold values for long-term CF, ΔK_<CF>, deduced from these curves are nearly equal to the threshold values for crack initiation at corrosion pits, ΔK*_<CF>, which are calculated assuming the pits as sharp cracks.
一般社団法人日本機械学会の論文
1989-04-15