The fatigue crack propagation behavior of the damage tolerant 2091 T8 was compared with that of 2024 T3. Constant amplitude tests were performed in vacuum, air, and NaCl solution at R = 0.175 and in air at R = 0.7. The variable amplitude tests included periodic underloads superimposed on constant amplitude tests at R = 0.7, and periodic overloads in combination with low R-ratio tests. In general it was found that the crack propagation resistance of 2091 was slightly inferior in the lower AK-region as compared to 2024, but somewhat better at higher AK-values. For both alloys predicted propagation rates based on constant amplitude tests were lower than the experimentally measured values with periodic underloads. Periodic overloads resulted in crack growth retardation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.