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The validity of using compact tension fatigue crack growth rate data to predict constant amplitude fatigue crack growth of part-through crack specimens was assessed. The assessment reported herein is one of six such assessments made by various members of the ASTM Task Group E24.06.01 on Application of Fracture Data in Life Prediction. Each of six members of this task group predicted the crack growth behavior for ten part-through crack specimens using compact tension crack growth rate data, with only one member having prior knowledge of the part-through crack test results. This author's assessment is presented in detail together with a comparison of the ratio of the analytical/experimental cycles to “breakthrough” and “failure” as determined by each of the six members of the task group.
compact tension, part-through crack, round robin, fatigue (materials), crack propagation
Aerospace engineer, Air Force Flight Dynamics Laboratory (AFFDL/FBE), Wright-Patterson AFB, Ohio