Fatigue strengths of aircraft materials : axial-load fatigue tests on notched sheet specimens of 24S-T3 and 75S-T6 aluminum alloys and of SAE 4130 steel with stress-concentration factors of 2.0 and 4.0

H. J. Grover, S. M. Bishop, L. R. Jackson
naca-tn-2389
Jun 1951


This report presents results of axial-load fatigue tests on notched specimens of three sheet materials: 24S-T3 and 75S-T6 aluminum alloys and normalized SAE 4130 steel. Notches included: Stress-concentration factor 2.0; Central circular hole, symmetrical edge notches, and fillets, as well as, stress-concentration factor 4.0; Symmetrical edge notches and fillets. For each type of specimen, fatigue tests were run at several levels of nominal mean stress, including a zero nominal mean stress.

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