Strength of Tubing Under Combined Axial and Transverse Loading Page: 4 of 32
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N.A.C.A. Technical Note No. 307
0.058, and 0.072 in.; and chrome-molybdenum steel tubes 1 in.
outside diameter with wall thicknesses 0.035, 0.049, and 0.188
in.*; 1-1/2 in. outside diameter with wall thicknesses 0.049,
0.065, 0.083, and 0.281 in.*; and 2 in. outside diameter with
wall thicknesses 0.065, 0.083, and 0.095 in.
These data have been studied in many ways in an effort to
draw from them conclusions of general validity, and by a combi-
nation of theoretical and empirical reasoning it has been found
possible to combine them into a form both suitable for practical
use and adapted to further study.
Basis of Study
Axial load: A previous unpublished study of column action
based on the Karman-Engesser double modulus
theory had shown that, in cases where second-
ary o detail failure did not occur, the data
on column tests were best compared by the in-
troduction of two new variables:
I f
r= and ~= 0
n EFc
Fc
where is the slenderness ratio of the
r
equivalent "round end" column,
*The tests on 0.188 in. and 0.281 in. wall thickness are not com-
. pleted and the experimental data on these tubes were not in-
cluded in the attached diagrams.3
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Tuckerman, L. B.; Petrenko, S. N. & Johnson, C. D. Strength of Tubing Under Combined Axial and Transverse Loading, report, June 1929; (https://digital.library.unt.edu/ark:/67531/metadc53994/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.