Abstract
This paper analyzes the interaction of external semi-elliptical surface crack and embedded elliptical crack in a longitudinal plane of a pressurized cylinder. No numerical solution appears to be available in the literature so far. The analyzed ratios of the crack depth to crack length ( b S/ a S and b E/ a E) are 0.25 and 1.0; the distance between both cracks ( s 1/ b min) ranges from 0.5 to 2.0. In total 24 crack configurations are analyzed and the stress intensity factors along the crack front are presented. The numerical results show that the interaction makes the stress intensity factors along the crack fronts increased for both the surface crack and the embedded crack, compared with the single surface crack and single embedded crack. For the given crack sizes, the stress intensity factors for both the surface crack and embedded crack increase with the decrease of the distance between two cracks. The numerical analyses are carried out by the hybrid boundary element method.
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