Abstract
The cracks in pressure vessels (e.g.thick wall cylinders) subjected to high internal pressure and thermal shocks are always radial, they are semi-elliptical in form and their number varies along the length of the cylinder. These cracks are often called star cracks or crazy cracks. Modelling of such a crack configuration is still a serious problem, as the actual number of cracks is not known. The paper presents a stress intensity factor solution as a function of crack length, number of cracks in the star and wall thickness simultaneously with a procedure how to determine the optimum number of cracks.
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