Abstract
Secure findings on the propagation behavior of fatigue cracks are essential for the evaluation of the safety of components and structures. Therefore the growth of cracks in the vicinity of material boundaries, whereas also accidental inclusions represent such material boundaries, has to be considered, too. Depending on the way an initial crack enters the region of influence of such a material boundary, the crack may grow towards or away from the material boundary. In both cases a curved crack path results that cannot be explained with the global loading but obviously with different stiffness relations.
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