ROTATING-BEAM FATIGUE TESTS OF NOTCHED ANDnUNNOTCHED 7075-T6 ALUMINUM-ALLOY SPECIMENS UNDERnSTRESSES OF CONSTANT AND VARYING AMPLITUDES

摘要

Unmatched and notched rotating-beam specimens made of 7075-T6 aluminum alloy were tested under constant and varying stress amplitude. Static mechanical properties and constant-amplitude fatigue tests of unmatched specimens yielded results higher than average for the material. Fatigue tests of notched specimens indicated the material was more notch sensitive than indicated by other data. Lives obtained in fatigue tests with variable amplitude were generally less than expected on the basis of the linear cumulative damage rule.