17. On Crack Arrestability by a Circular Hole Based on Computational Crack Path Prediction

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In stiffend plate structures, cracks are sometimes formed at the intersections of stiffeners due to severe stress concentration. Since the local stress distribution is rather complicated along the crack trajectory, crack curving is one of the essential features of this type of crack problems. In order to predict the fatigue and brittle fracture behaviour and also to develop useful crack arrest concepts of such structures, not only material properties, which determine the fracture toughness or fatigue crack growth rate, but also possible geometrical paths of cracks should be evaluated with sufficient accuracy. A computational scheme has been developed for the crack path prediction, which is performed by the step-by-step stress analysis ahead of the crack tip combined with an analytical expression of the curved increment of the crack path in the neighborhood of the crack tip. The locally symmetric condition, which requires the Mode II stress intensity factor vanishing along the entire crack path, is used as a crack path criterion. In practice, holes are sometimes considered as crack arresters for stiffened plate structures. In the present paper, the validity of holes as crack arresters, which are sometimes called stop holes, is examined by the use of the present computational crack path prediction and also by experiments. Considering a crack approaching a circular hole, it is found that if the shortest distance between the crack tip and the edge of the hole is within the hole radius, they may attract with each other resulting the crack arrest at the hole.
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17. On Crack Arrestability by a Circular Hole Based on Computational Crack Path Prediction

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