Creep Strength of Stabilized Wrought-Aluminum Alloys Page: 2 of 16
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1 3 1176 01440 7101
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECHNICAL MEMORANDUM NO. 960
CREEP STRENGTH OF STABILIZED WROUGHT-ALUMINUM ALLOYS*
-By W. Muller,
1. PREVIOUS TESTS
Report No. 540/35 contained a description of then-
available equipment for testing the creep strength of. alu-
minum alloys as well as the test results. This original
equipment, employing the Rohn system, is semiautomatic
and affords practical values corresponding approximately
to the creep strength. Individual strain measurements
with the Martens mirror instrument on test bars at a load
corresponding to the creep strength obtained earlier at
elevated temperature, disclosed a rate of strain substan-
tially lower than specified, according to the definition
of "creep strength" (DVM. standard): rate of elongation =
1/1000 percent per hour, from the 25th to 35th hour of
loading; the plastic deformation after the 45th hour of
loading should not exceed 0.2 percent.
2. NEW TESTING ARRANGEMENT
Since then the Rohn-type equipment has been mounted
on rubber blocks, for the purpose of damping the vibra-
tions of the ground and of rendering the plastic yielding
of the test bars less subject to outside interferences.
New equipment also included three shockproof creep-testing
machines with the Martens mirror instruments for recording
the strain curve of the fatigue-tested specimens. For the
control and maintenance of a constant test temperature in
the heating oven of the creep-testing machines, rheostats
were mounted on a special control panel, and for the elim-
ination of voltage fluctuations in the alternating-current
system, each group of machines is fitted with an auxiliary
oven that keeps the supplied quantity of electricity con-
Abbreviated copy of Report No. 536, entitled: "Warmdauer-
st andfestigkeit stabilisierter Aluminium-Knot-Legier-
ungen." Aluminum-Industrie A.G.-Neuhausen, Switzarland,
December 30, 1939.
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Müller, W. Creep Strength of Stabilized Wrought-Aluminum Alloys, report, November 1940; (digital.library.unt.edu/ark:/67531/metadc63167/m1/2/: accessed February 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.