Analysis of the Ultimate Strength and Optimum Proportions of Multiweb Wing Structures Page: 8 of 35
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NACA TN 3633 7
EXPERIMENTAL DATA
Bending tests of integral and fabricated multiweb beams were performed
in the combined load testing machine of the Langley structures research
laboratory in order to determine the maximum strength of multivweb beams
with stiff web-skin attachments. The results of the integral-beam tests
are used to substantiate the assumptions made concerning web behavior, as
regards both stress distribution and minimum thickness requirements, and
skin strength. The results of the fabricated-beam tests are used to deter-
mine the applicability of the maximum-strength equations to practical,
riveted multiweb structures.
Test Specimens
The integral beams consisted of one or two cells. (See fig. 1.)
The one-cell integral beams were drawn, square tubes with thickness ratio
tw/tS, and skin thickness tS varied by machining skin and/or webs to the
desired thicknesses. The two-cell integral beams were constructed from
E-section extrusions by riveting a tension cover to the web flanges and
machining the webs and compression skins to obtain the various values of
tw/tS. The three-cell fabricated beams were constructed by using two
extruded angles riveted together to form a channel-type web. (See fig. 1.)
The cross-sectional dimensions of the angle extrusions are shown in fig-
ure 1. Material properties of all test specimens are presented in table I;
specimen dimensions and the significant dimension ratios are given in
tables II and III, respectively.
Test Results
Integral beams.- The results of the tests of one- and two-cell
integral beams (see table IV(a)) were used to determine the validity of
the assumption that a in equation (3) equals 1/4.
The value of a can be determined from equation (3), when ae = a2,
as
1 Mw
2p-b"?
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Rosen, B. Walter. Analysis of the Ultimate Strength and Optimum Proportions of Multiweb Wing Structures, report, March 1956; (https://digital.library.unt.edu/ark:/67531/metadc57902/m1/8/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.