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Due to the complexity of both geometry and stress distribution, the analysis of cracks in the transition region of nozzle-to-cylinder junctions, where local peak stresses promote crack extension, constitutes one of the most complicated problems in a fracture mechanics based design procedure as adopted in the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Section III, Appendix G) for nuclear pressure vessels. Results of studies on this subject are scarce. This paper reviews results obtained in the last two years within a Netherlands cooperative research program mainly directed at the nozzle corner crack problem and covers both theoretical and experimental investigations. Significant conclusions from these studies are also presented.
crack propagation, fractures (materials), nozzles, fatigue (materials), pressure vessels, finite elements, stress intensity factors
Laboratory for Thermal Power and Nuclear Engineering, Delft University of Technology, Delft,