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 Page: 2 of 65
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTIC
TECH UBRARY KAr., NrM
TECHNICAL NOTE 2389
FATIGUE STRENGTHS OF AIRCRAFT MATERIALS
AXIAL-LOAD FATIGUE TESTS ON NOTCHED SHEET SPECIMENS
OF 24S-T3 AND 755-T6 ALUMINUM ALLOYS AND OF
SAE 4130 STEEL WITH STRESS-CONCENTRATION
FACTORS OF 2.0 AND 4.0
By H. J. Grover, S. M. Bishop, and L. R. Jackson
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:
(1) Stress-concentration factor 2.0: Central circular hole, sym-
metrical edge notches, and fillets
(2) Stress-concentration factor 4.0: Symmetrical edge notches
For each type of specimen, fatigue tests were run at several levels of
nominal mean stress, including a zero nominal mean stress.
Fatigue strengths for these notched specimens are compared with
values previously reported for unnotched specimens of the same sheet
This is the second of a series of reports summarizing work on an
investigation of the fatigue strengths of metals used in aircraft con-
struction. The investigation, conducted at Battelle Memorial Institute,
under the sponsorship and with the financial assistance of the National
Advisory Committee for Aeronautics, has the objective of obtaining
extensive basic data on the fatigue properties of three widely used
sheet materials: 24S-T3 and 75S-T6 aluminum alloys and SAE 4130 steel.
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Grover, H. J.; Bishop, S. M. & Jackson, L. R. 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, report, June 1951; (https://digital.library.unt.edu/ark:/67531/metadc56104/m1/2/: accessed October 16, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.