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Proposal of a new subsurface-to-surface flaw transformation rule for fatigue crack growth analyses

疲労亀裂進展解析に係る内部亀裂から表面亀裂に置換える新しい規定の提案

Lacroix, V.*; Bouydo, A.*; 勝又 源七郎*; Li, Y.; 長谷川 邦夫

Lacroix, V.*; Bouydo, A.*; Katsumata, Genshichiro*; Li, Y.; Hasegawa, Kunio

This paper summarizes the steps leading to the improvement of the ASME Code Section XI subsurface-to-surface proximity rule. Based on fatigue crack growth calculations and refined investigations, the paper proposes a new limit value for the surface proximity factor. As a result, a proposal for modification of the ASME Code Section XI, Appendix C is provided. The paper is used for the technical basis of this proposal.

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