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 factor of 1.5

H. J. Grover, W. S. Hyler, L. R. Jackson
naca-tn-2639
Feb 1952


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. Each specimen was notched by edge notches designed to have a theoretical stress-concentration factor of 1.5. Tests were run at four levels of nominal mean stress: 0, 10,000, 20,000, and 30,000 psi.

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