Compressive Strength of Flat Panels With Z-Section Stiffeners Page: 3 of 20
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2
tg thickness of sheet
rA radius of bend between web and attachment flange
rF radius of bend between web and outstanding flange
L length
c end-fixity coefficient in Euler column formula
ocr buckling stress of sheet
amax average stress in panel at maximum load
TEST SPE IITNS
The specimens used in the tests were constructed of
24S3-T aluminum alloy with the grain in both sheet and
stiffeners parallel to the longitudinal axis of the stiff-
enecs;. Longitudinal stress-strain curves representa-
tive of the group of specimens for which the ratio
tv/tS was 0.51 are presented in figure 2. Inasmuch as
the investigation of which these tests are a part is
still in progress, a complete set of stress-strain curves
is not yet available,
The stiffeners for all panels were formed from sheet
material 0.064 inch thick. From the value ty = 0.064,
the actual dimensions of any panel can be determined
from the dimension ratios subsequently presented herein.
A knowledge of the actual dimensions is not necessary,
however, because the stresses that can be carried are
established by the relative dimensions of a panel.
The stiffeners were attached to the sheet with
machine-countersunk flush rivets driven by an NACA flush-
riveting procedure. These rivets consisted of ordinary
flat-head rivets inserted from the stiffener side of the
joint, the countersunk heads being formed in the driving
process, A flush-rivet milling tool of the type de-
scribed in reference 2 was used to remove the portion of
the formed countersunk head that protruded above thesheet surface after driving. The rivets in each stiff-
Ener were driven in a single operation on a Cincinnati
press brake as shown in figure 3. Machine-countersunk- .- -I& . - --I -rn,
- . . -. *,a ?C.;,a ...,r . 'V & :- r **
~ r~C~i r . ~i ,~;F de
u p Fw'
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Rossman, Carl A.; Bartone, Leonard M. & Dobrowski, Charles V. Compressive Strength of Flat Panels With Z-Section Stiffeners, report, February 1944; (https://digital.library.unt.edu/ark:/67531/metadc60979/m1/3/: accessed April 22, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.