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Effect of interaction of embedded crack and free surface on remaining fatigue life

埋没亀裂と自由表面の干渉効果による疲労余寿命への影響について

勝又 源七郎*; Lacroix, V.*; Li, Y.

Katsumata, Genshichiro*; Lacroix, V.*; Li, Y.

This paper focuses on the interaction between an embedded crack and a free surface of a component as well as on its effects on the remaining fatigue lives of embedded cracks using the proximity rules provided by the FFS codes. It is shown that the remaining fatigue lives for the embedded cracks strongly depend on the crack aspect ratio and location from the component free surface. In addition, it can be said that the proximity criteria defined by the API and RSE-M codes give overly conservative remaining lives. On the contrary, WES and AME codes always give long remaining lives and non-conservative estimations. When the crack aspect ratio is small, ASME code gives non-conservative estimation.

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