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美国政府科技报告
>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
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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
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 413O 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.nResults of these tests extend information previously reported from tests on unmatched specimens and tests on specimens more severely notched and afford data on the variation of fatigue-strength reduction with notch severity.
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