回し溶接止端部から発生・伝播する表面き裂の疲労寿命推定法について : 無き裂状態から任意の大きさのき裂になるまでの疲労寿命推定法

概要

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In the previous paper, we proposed an algorithm of fatigue life assessment by ΔK_<RP> approach without distinguishing between the crack initiation and the crack propagation. Moreover we developed a simulation model of fatigue crack opening and closing phenomena in an arbitrary stress distribution field. For the purpose of estimating fatigue crack propagation life in complex elements, an equivalent distribution stress was introduced into the simulation program, which is difined as stress distribution in an infinitely wide plate giving the same K value in the elements. In this paper, we carried out fatigue tests with a gusset welded specimen and compared the experimental S-N curve with the estimated one using the above algorithm and the simulation program. As a result, it is confirmed that the estimated S-N curve is in good agreement with experimental one.
社団法人日本船舶海洋工学会の論文
2000-03-29