In this paper the fatigue behaviour of a nozzle-to-vessel intersection is studied. This geometry is typical in pressure vessels. Numerical models are investigated in order to predict the fatigue life. These studies are validated by an experimental program including a fatigue test of a real size pressure vessel, fatigue tests of structural details and fatigue tests of small scale and smooth specimens. Comparisons between predictions obtained using proposed models and predictions obtained using procedures included in design codes are carried out.

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