Tests of Aerodynamically Heated Multiweb Wing Structures in a Free Jet at Mach Number 2: Two Aluminum-Alloy Models of 20-Inch Chord With 0.064- and 0.081-Inch-Thick Skin Page: 2 of 40
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TECH LIBRARY KAFB, NMP
NACA RM L55F13 CONFIDENTIAL I I I 014415
NATIONAL ADVISORY CCIMITTEE FOR AERONAUTICS
TESTS OGF AERODYNAMICALLY HEATED MULIWEB WING
STRUCTURES IN A FREE JET AT MACH NUMBER 2
TWO AI MINUM-ALLOY MODELS OF 20-INCH CHRED
WITH 0.064- AND 0.081-INCH-THICK SKIN
By George E. Griffith, Georgene H. Miltonberger,
and Richard Rosecrans
Two 2024-T5 aluminum-alloy multiweb wing structures (MW-2 and MW-3),
representative of airplane or missile wings, were tested at a Mach num-
ber of 2 under simulated supersonic flight conditions, and temperatures
and strains were measured. The first model failed dynamically toward the
end of its test because of the combined action of aerodynamic heating and
loading. The second model, with thicker skin, survived tests up to an
angle of attack of 3.50 but failed statically at an angle of attack of 50o
The model skin temperatures were in fair agreement with calculated values,
but the stresses generally did not agree with expected results, possibly
because of difficulty in converting the strain-gage data.
As part of a program investigating the effects of aerodynamic heating
on aircraft structures, the Structures Research Division of the Langley
Laboratory is testing multiweb wing models under aerodynamic conditions
similar to those encountered in supersonic flight at a Mach number of 2.
The first structure MW-1, a multiweb wing of O40-inch chord and span, was
tested primarily to obtain data on the temperature distribution, but the
aerodynamic loads played an unanticipated role in that the model experi-
enced a dynamic failure near the end of the test. Details of the test
results and failure of model MW-1 are presented in reference 1, and the
preliminary experimental results for the first seven models in the test
program are given in reference 2.
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Griffith, George E.; Miltonberger, Georgene H. & Rosecrans, Richard. Tests of Aerodynamically Heated Multiweb Wing Structures in a Free Jet at Mach Number 2: Two Aluminum-Alloy Models of 20-Inch Chord With 0.064- and 0.081-Inch-Thick Skin, report, August 9, 1955; (https://digital.library.unt.edu/ark:/67531/metadc61471/m1/2/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.