Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7963241 | Journal of Nuclear Materials | 2018 | 9 Pages |
Abstract
The effect of dK/da on crack growth behavior of nickel base alloys has been studied by conducting stress corrosion cracking tests under positive and negative dK/da loading conditions on Alloys 690, 600 and X-750 in high temperature water. Results indicate that positive dK/da accelerates the SCC growth rates, and the accelerating effect increases with dK/da and the initial CGR. The FRI model was found to underestimate the dK/da effect by â¼100X, especially for strain hardening materials, and this underscores the need for improved insight and models for crack tip strain rate. The effect of crack tip strain rate and dK/dt in particular can explain the dK/da accelerating effect.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Kai Chen, Jiamei Wang, Donghai Du, Peter L. Andresen, Lefu Zhang,