Comparison of Three Methods for Calculating the Compressive Strength of Flat and Slightly Curved Sheet and Stiffener Combinations Page: 2 of 32
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECHNICAL NOTE NO. 455
COMPARISON OF THREE METHODS FOR CALCULATING
THE COMPRESSIVE STRENGTH OF FLAT AND SLIGHTLY
CURVED SHEET AND STIFFENER COMBINATIONS
By Eugene E. Lundquist
This report gives a comparison of the accuracy of
three methods for calculating the compressive strength of
flat sheet and stiffener combinations such as occur in
stressed-skin or monocoque structures for aircraft. Of
the three methods based upon various assumptions with re-
gard to the interaction of sheet and stiffener, the method
based upon mutual action of the stiffener and an effective
width of sheet as a column gave the best agreement with
the results of tests.
An investigation of the effect of small curvature re-
sulted in the conclusion that the compressive strength of
curved panels is, for all practical purposes, equal to the
strength of flat panels except for thick sheet where non-
uniform curvature throughout the length of the panel may
cause the strength of a curved panel to be as much as 10
to 15 per cent less than the strength of a corresponding
In the recent literature on the strength of stressed-
skin or monocoque structures for aircraft, several methods
are suggested for calculating the compressive strength of
sheet and stiffener combinations. The purpose of this re-
port is to compare the accuracy of the methods suggested
for flat sheet and stiffener combinations and to investi-
gate the effect of small curvature on the compressive
strength of a curved sheet and stiffener combination. ror
convenience of reference, the methods have been designated
A, B, and C.
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Lundquist, Eugene E. Comparison of Three Methods for Calculating the Compressive Strength of Flat and Slightly Curved Sheet and Stiffener Combinations, report, March 1933; (digital.library.unt.edu/ark:/67531/metadc54181/m1/2/: accessed January 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.