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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
WAllRTIMIE RE PORT
August 1942 as
TESTS OF A STRESS-CARRY3lG DOOR IN SHEAR
By Robert Gottlieb
Langley Memorial Aeronautical Laboratory
Langley Field, Va.
NACA WARTIME REPORTS are reprints of papers originally issued to provide rapid distribution of
advance research results to an authorized group requiring them for the war effort. They were pre-
viously held under a security status but are now unclassified. Some of these reports were not tech-
nically edited. All have been reproduced without change in order to expedite general distribution.
NATIONAL ADVISORY CO'MITTIE FOR AEROUTAUTICS
TESTS OF A STRESS-CARRYIN:G DOOR IN SHEAR
By Robert Gottlieb
A monocoque box with a stress-carrying door was
male ani teste" in torsion. The details of this box
and the location of the applied torques are shown in
figure 1. Outside and inside -iews of the stress-
carrying door are shown in figure 2.
The results of the torsion tests are presented in
figures 3, 4, and 5. In figure 3 are plotted torque-
twist curves fcr ttc case of cut-out, cut-out with 0oor,
and no cut-out. The'so -urves show that a large part of
the torsional stiffness lost by making a cut-out can be
recovered Ly use of a stress-carrying door. This fact
is more clearly, rev-aled in figure 4 were the slopes
of the curves in figure 3, which define the torsional
stiffness, are plotted against the applied torque. The
ratio b/a in this figure is measure of thoe effective-
ness of thL door in recovurin,' th- torsional stiffness
lost ivhen: the cut-out was made. This effectiveness varies
with the -:pplicd toroqu, as shown in figure 5.
If a stress-cirrying door and its frame are made
sufficiently heavy, the torsional stiffness of the box
with the door crn be made -reater than the torsional
stiffness of the box without the cut-out. In the sneci-
men of figure 1, tnc stress-carrying door was made ,!ith
the same Gago of skin as was used in the box and with
stiffeners of less depth than the stiffeners in the box.
The smaller stiffeners in the door wur.: use d in order
to make the total thickness of the door approxirrately the
same as the total thickness of the skin and the stiffeners
in the box.
Langley Memorial Aeronautical Laboratory,
National Advisory Committee for Aeronautics,
Langley Field, Va.,
NACA Fig. 1
A 1, 'AXL
4. Nt .4 X
C/ / Ix .'. "% *> >;
0 -1 4 I <'
,*';* ,,- ---- -- C
,, i ,,I *7 + .2
4. I.\, ,.
/,.- \,-"\ .,/^ -
5 */,' \.A c', .2
,/ t C,
--1" -- ... -l ', -' .\J '' -'r
A. ., .+ ./ / 1
I o '
-f. C^ ^.. *.> '2// -
.' \ -IV
o / o I
,\ / ,/9: _4 -,
J' .' S* ;
*v Cju4 "
-r .. 'D /* -
100oo x o10 3 --I -- -
7---- ..i--- -- -- ----- --
- -!-- t- ----- t' -^-- -
I I I // _,/_ _
i I / A '! 1
0 Cut-out with door
-- 7 -o---, ..- -
0 i i t
.X02 .004 .006 .CO0
Figure 3.- Torque-t-'ist, curves for box.
Digitized by Ihe Inte net Archive
in 21111 will lLunding Irom
University ol Florida, George A. Smathers Libraries wilh support from LYRASIS and the Sloan Foundallon
http: www.archive.org details leslsofslresscarlOilang
40 40 60 80 :
Figure 4.- Torsional stiffness of bo::.
e4 x 106
ITACA Fi'. 5
2 .-_-__..-- __.-------
I -I -i -
'. 2 -
i I -I i
0 40 0 6 EO :: 1iO3
Figure o.- Effectiveness of door.
UNIVERSITY OF FLORIDA
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