OS0917-274 円筒の周方向複数欠陥の応力拡大係数評価法

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  • OS0917-274 Stress intensity factor assessment method of multiple circumferential flaws in a cylinder

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Flaw evaluation methods defined in the Fitness-for-Service Codes of Japan Society of Mechanical Engineers are applicable limited to a single flaw. However, multiple stress corrosion cracks were observed in a weld joint in some components of nuclear power plants, such as recirculation system piping of boiling water reactors. For applying to the flaw evaluation like this case, stress intensity factor evaluation method for multiple circumferential flaws in a cylinder was examined in this study. Based on the solution of stress intensity factor for a single flaw, procedure to evaluate stress intensity factor for multiple circumferential flaws was proposed. The proposed method is applicable to arbitrary flaws (sizes and positions) subjected to bending moment.

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