船体横強度部材の溶接部における疲労強度の統計約推定について

概要

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In this report is studied the method predicting the fatigue crack initiation life, Nc, with probability of failure, P, in welded structure members of mild steel. As a result, it is shown that the P-ΔS-Nc curve in weld toe of structure members could be estimated using the P-Δε-Nc curve in mild steel and the expectation and variance of logarithm of elastic stress concentration factor, ln (K_t^^w), in weld toe. The propriety of the P-ΔS-Nc curve in the transverse strength members of ship hull construction is confirmed by the comparison with the results of fatigue test on the model of the various transverse strength members, and it is clarified that the ΔS-Nc curve at P=5% is available as the design curve for high cycle fatigue more than 10^4 cycles.
社団法人日本船舶海洋工学会の論文
1981-09-30