Additional Fatigue Tests on Effects of Design Details in 355-T6 Sand-Cast Aluminum Alloy Page: 2 of 25
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NATIONAL ADVISORY CCMEITTEE FOR AERONAUTICS
RESEARCH MEMORANDUM
ADDITIONAL FATIGUE TESTS ON EFFECTS OF DESIGN DETAILS
IN 355-T6 SAND-CAST ALUMINUM ALLOY
By I. D. Eaton and John A. Youra
SUMMARY
Additional static and fatigue tests were made on aluminum-alloy 355-T6
sand-cast specimens. Direct-stress fatigue tests were made on plate-type
specimens with a single 1-inch-diameter as-cast cored hole and on specimens
in which the cored hole was reamed to 1~ -inch diameter. In addition,
16
direct-stress fatigue tests were made on O.300-inch-diameter specimens,
with various degrees of porosity, machined from the butt ends of plate-
type specimens. Comparisons are made with the results of earlier tests,
on plate-type specimens with variations in design details such as bosses
and ribs, given in NACA Technical Note 2394.
Within the range of stresses used, there were no significant differ-
ences in the fatigue strengths of sand-cast specimens with a 1-inch-
diameter cored hole when tested with the hole in the as-cast condition or
with the hole enlarged 1/16 of an inch in diameter by reaming. When the
results of tests on the specimens with a 1-inch-diameter cored hole are
compared with results, from the previous investigation, for specimens in
which a small cast boss was removed and a 1-inch-diameter hole drilled and
reamed in the center of the plate-type specimen there is found to be no
significant difference in the results except for a slight difference in
the static strengths.
The direct-stress fatigue test results on O.300-inch-diameter round
polished specimens indicate no correlation between the fatigue strengths
developed and visual porosity ratings.
INERODUCTION
In July of 1951 the Aluminum Research Laboratories of the Aluminum
Company of America reported in reference 1 direct-stress fatigue test
results for plate-type specimens in 555-T6 sand-cast aluminum alloy with
variations in design details including bosses, with and without centrally
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Eaton, I. D. & Youra, John A. Additional Fatigue Tests on Effects of Design Details in 355-T6 Sand-Cast Aluminum Alloy, report, March 10, 1954; (https://digital.library.unt.edu/ark:/67531/metadc59956/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.