Abstract
In the field of nuclear power plants, structural components working at high temperature under cyclic conditions are the locations of many complex phenomena. The severe requirements in design procedures require the development of lifetime prediction techniques which take into account a crack initiation under creep and fatigue conditions. The prediction of macroscopic crack initiation is generally made through more or less simple parametric equations, relating lifetime to some stabilized cyclic quantities such as elastic or inelastic strain ranges. In steam generator, the shell nozzle junction is subjected to cyclic loads with subsequent plastic strains that cause propagation of fatigue cracks. It is possible to predict the life of this mechanical component by utilizing the life strain curve ε-Nf. In this paper life predictions are performed for shell nozzle junction and these results are compared with experimental results.
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