论文部分内容阅读
The mechanical state at the tip of stress corrosion cracking(SCC)is one of the key factors affecting SCC behavior.Although standard specimens are generally adopted to maintain certain mechanical state at the crack tip in SCC experiments in simulated light water reactor environments,the mechanical state at the crack tip of specimens would be still affected by many factors.By elastic-plastic finite element method,the approach to obtain detail mechanical state nearby the tip of SCC in various complex conditions,the effect of the weld mechanical heterogeneity and residual stress on the mechanical state at the SCC tip and the mechanical relation of the oxide film and base metal at the SCC tip are investigated and discussed in this study.The results would provide an approach for improving the predicting accuracy of SCC growth rate in SCC experiment of nuclear structure materials,and the results are also expected to form a bridge between predicting SCC growth rate in core materials and evaluating EAC growth in key structural components in light water reactors.