Fractographic Observations on Fatigue Crack Growth in 2024-T3 Sheet Material under Flight-Simulation Loading

摘要

Fatigue crack propagation was studied under random flight simulation loading and two types of programmed flight sequences. Tests were carried out on 2024-T3 Alclad specimens. Fractographic observations were made to determine the severity of individual flight types. Altogether up to 7 different flight types from a total of 10 types could be distinguished on the fatigue failure surfaces, and the severity on the basis of results of crack extension measurements was determined.