Stress analysis of monocoque fuselage bulkheads by the photoelastic method Page: 2 of 56
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECENICAL NOTE NO. 870
$TRESS ANALYSIS OF MONOCOQUE FUSELAGE BULKHEADS
BY THE PROTOELASTIC METHOD
ByBehjamin F. Ruffner
An investigation was made to determine the possibil-.
ity of using the photoe plastic method for the stress analy-
sis of bulkheads in monocoque structures. The method was
applied to several typical bulkheads including a circular
ring with floor beam, a circular ring attached to the main
wing spar, and a flying-boat bulkhead. Methods for the
construction of models and test technique are given.
Tests of circular ring models were made to determine the
effect of the skin thickness on the model results. Cor-
rection factors .for the elimination of skin effect are in-
cluded. The results indicate that the photoelastic method
is quite accurate. The method is recommended for use
where bulkheads with a large number 6f redundancies are
I NTRODUCT ION
Since the monocoque and the semimonocoque types of
construction have come into general use, many analytical
methods of stress analysis of stiffening rings and bulk-
heads have been published. The simplest type, the circu-..
lar ring of constant bending stiffness, offers some ana-
lytical difficulty although many special cases f loading
for this type have been treated (references 1, 2, and 3).
Certain general methods of analysis of noncircuiar, non-
uniform rings have been disucdsed (references 4 and 5),
but the use of these'methods involves either extremely
complicated analysis or laborious graphical methods. In
actual aircraft structures circular ring bulkheads of
uniform section are usually not the most efficient design.
In many actual cases the analysis of the bulkheads is
further complicated by the attachment of floTor beams, wing
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Ruffner, Benjamin F. Stress analysis of monocoque fuselage bulkheads by the photoelastic method, report, December 1, 1942; (digital.library.unt.edu/ark:/67531/metadc54752/m1/2/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.