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Interaction factors for two elliptical embedded cracks with a wide range of aspect ratios

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan

Special Issues: Interaction of Multiple Cracks in Metallic Components-Volume 2

The value of stress intensity factor may be increased through the interaction of multiple cracks that are in close proximity to one another. We investigated the interaction factors of two equal elliptical cracks with a wide range of aspect ratios. Finite element analysis for a linear elastic solid was used to obtain the interaction factor for embedded cracks in an infinite model subjected to remote tension loading. Relationships between interaction factors and dimensionless distances between the cracks were discussed. The results demonstrated that the interaction factors depend on the crack aspect ratio, whose effect is related to the dimensionless distance. Thus, it is suggested that interaction factors can be reasonably characterized using different dimensionless distances depending on the aspect ratio. Finally, we provide a simple empirical formula for obtaining the interaction factors for embedded cracks.
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