Effect Of Oxide Film Crack Length On Film-Induced Stress In Stress Corrosion Cracking Tip

Oxide film rupture theory has become one of the most popular models to quantitatively predict the stress corrosion cracking rate at crack tip of Ni-based alloys in high temperature water nuclear environment. To understand the micro-mechanical state at the tip of environment assisted cracking (EAC) without considering the external load, the stress-strain induced by oxide film in the base metal at the EAC tip was simulated and discussed using a commercial finite element analysis code. Results show the stress-strain state induced by oxide film is different because of crack length, and film-induced stress is one of the main factors that can't be ignored in the stress corrosion crack growth driving force. The study also provides a foundation to improve the quantitative predication accuracy of EAC growth rate of nickel-based alloys and austenitic stainless steels in the important structures of nuclear power plants.