Abstract
Synergistic/interaction action of the multiple cracks can be clearly observed from fracture topography of the post-fatigue test specimen. Based on experimental observations, the interactions of two parallel non-coplanar cracks mounted in double-edge crack specimens under tension loading are investigated. The stress intensity factor (SIF) for a wide range of crack configurations is established using three-dimensional finite element analysis (FEA), and the effects of multiple crack interactions on the SIF values are studied. The effects of crack interactions on the SIF are strongly dependent on the crack geometry. The greater the vertical distance between the two cracks, the more strongly the stress field at the tip of the main crack is impacted. The analytical solutions for calculating SIF under effect of the multiple crack interactions were derived in a matrix form and the accuracy of the estimated equation was confirmed.
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