Elastoplastic analysis of a radial nozzle in a spherical shell under cyclic loading

摘要

In this paper a radial nozzle in a spherical shell with 0.5 opening radio under cyclic bodice is analysed by the elastoplastic finite element method. We adopt a novel constitutive model for cyclic plasticity, proposed previously by the authors,to the finite element analysis . We then present the details of distribution and varying process of the stress, strain end plastic zones during cyclic loading. These phenomenological data would be useful in the lost cycle fatigue end damage analysisof pressure vessels. The validity of the finite clement analyses and the constitutive equations describing plastic behavior of materials has been verified by correponding experiments.