Abstract
Fatigue crack shape is simulated through a theoretical model for part-through cracks in a hollow cylinder under cyclic pressure. The defect is assumed to have an elliptical-arc shape. The propagation path of the surface flaw is obtained as a diagram of aspect ratio ϵ against relative depth b/ t. The numerical procedure calculates the local growth increments at a set of points defining a crack front by employing a fracture damage zone size model, that can directly predict the shape development of propagating cracks. The aspect ratio changes during crack growth are obtained and compared with the limited experimental data found in the literature. Thick- and thin-walled cylinders, and also semi-elliptical internal surface flaws are considered. The influence of the elasto-plastic characteristics of the steels’ different properties, related to test temperature, on the aspect ratio variation is studied.
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