Calculation of load distribution in stiffened cylindrical shells Page: 2 of 70
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TXOHNICAL MEMORANDUMM NO. 866
CALCULATION OF LOAD DISTRIBUTION IN
STIFFNED .CYLINDRICAL SHELLS*
By H. Xbner and H. Keller
Thin-walled shells with strong longitudinal and trans-
verse stiffening (for example, stressed-skin fuselages and
wings) may, under certain simplifying assumptions, be
treated as static systems with finite redundancies. In
this report the underlying basis for this method of treat-
mont of the problem is presented and a computation proco-
dure for stiffened cylindrical shells with curved sheet
panels indicated. A detailed discussion of tho force dis-
tribution duo to applied concontrated forces is given, .and
the discussion illustrated by numerical examples whichre-
for to an experimentally determined circular cylindrical
shell The test results reported by E. Schapits and G.
Krmling in a simultaneously appearing paper (reference 1),
confirm the reliability of tho method proposed.
Tho determination of the stress distribution in
stressed-skin (or monocoque) wings and fuselages, accord-
ing to the elementary Navier theory for the bending of
beams, or the Bredt theory for the torsion of thin-walled
hollow bodies, is based on the preliminary assumption that
the applied forces correspond to the elementary stress
distribution. Large disturbances, which as characteristic
additional stresses are superimposed on the elementary
stresses, arise on the application of concentrated longi'
tudinal forces - such, for exanple, as occur at a closed
shell where the continuity of the structure is interrupt-
ed by a cutaway portion. (Seo fig. Ia.)
Further deviations from the simple state of stress in-
dicated by the abovo theories arise on torsion and bonding
11Zur Berechnung des'Kraftvorla fes in versteiften Zyln--
derschalen." Luftfahrtforohung, vol. 14, no, 12,
Docombor 20, 1937, pp. 607-626.
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Ebner, H & Koller, H. Calculation of load distribution in stiffened cylindrical shells, report, June 1, 1938; (digital.library.unt.edu/ark:/67531/metadc63311/m1/2/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.