Comparative Tests on Extruded 14S-T and Extruded 24S-T Hat-Shape Stiffener Sections Page: 2 of 18
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NASA Technil Ubrary
3 1176 01425 7563
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECHNICAL NOTE NO. 1172
COMPARATIVE TESTS ON EXTRUDED 14&-T AND
EXTRUDED 24S-T EAT-SEAPE STIFFNE SECTIONS
By Marshall Holt and G. W. Feil
INTRODUCTION AND OBJECT
The investigation descrfbed.in this report is a comparison ~f 148-T
with 24-T in extrtLed stiffeners for stiffenedrflat sheet panels.
Since considerable basic information is available for 248-T, ~E'Was
selected as the criterion for comparison.>
Continued interest has been shown by the aircraft i(dustty in
investigations of high-strength aluminum alloy stiffened panels
tested in edge compression. Stiffened sheet panels are used very
frequently in aircraft as structural members carrying axial loads.
The tests and specimens were similar to those previously made at
the Almtinum Research Laboratories. (See reference 1.)L
These tests were made with stiffened flat sheet panels having
three hat-shape stiffeners. Two gages of sheet were used; one was
25 percent thicker than the stiffeners and the other was 25 percent
thinner. This provided data which not only compared the strengths of
the two alloys but also showed the effet of sheet thickness on rela-
ttve stiffener strengths. Full-section compressive tests were made on
short lengths of the stiffeners of both alloys to determine the rela-.
tire strength of the sections without any effect from sheet.
SPECIMENS
The sheet used was commercial 248-T of 0.093- nd 0.156-inch
thickness. The stiffeners were commercial extruded shapes of hat-shape
section and were made by Die No. K-12454. The nominal dimensions and
section elements are shown in figure 1. The specimens were constructed
so that the sheet was tested in the direction of rolling.
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Holt, Marshall & Feil, G. W. Comparative Tests on Extruded 14S-T and Extruded 24S-T Hat-Shape Stiffener Sections, report, March 1947; (https://digital.library.unt.edu/ark:/67531/metadc55260/m1/2/: accessed May 1, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.