Dwell-Time Fatigue Crack Growth in Ni-Base Superalloys

摘要

The state-of-the-art dwell-time fatigue crack growth models applicable to materials systems such as Waspaloy, Rene'95, Rene'88 and IN 100 were critically assessed. The review included models based on linear elastic fracture mechanics (LEFM) and those based on time dependent fracture mechanics (TDFM). The pertinent creep deformation and time and cycle dependent crack growth rate data on these materials were also collected to enable the evaluation of these models and for the establishment of their respective regimes of applicability and their limitations. The gaps in the available experimental and computational data for implementing the promising models were identified as part of the review. An experimental test plan and a plan for providing computational needs for addressing these shortcomings are proposed.