応力拡大係数解に求められる評価精度に関する検討

概要

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Stress intensity factor solutions, which are used as a dominant fracture mechanics parameter for the evaluation of fatigue crack growth, are frequently provided in the form of the discrete tables of the coefficient factors. The accuracy of the coefficient factors essentially affects the reliability of the prediction of the fatigue life. In this paper, the effect of the variation of the coefficient factors on the crack growth analysis results was studied for a circumferentially surface cracked cylinder subjected to axial cyclic loads, and the evaluation accuracy required for the coefficient factors of the stress intensity factor solutions was examined. In the scheme of the flaw evaluation procedure provided in the Japan Society of Mechanical Engineers rules on fitness-for-service for nuclear power plants, the accuracy required for the correction factors of the stress intensity factor solution was approximately 1% at least.