Stress Analysis of Monocoque Fuselage Bulkheads by the Photoelastic Method Page: 2 of 56
This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
3 1176 01433 2184
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
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Ruffner, Benjamin F. Stress Analysis of Monocoque Fuselage Bulkheads by the Photoelastic Method, report, December 1942; (digital.library.unt.edu/ark:/67531/metadc54752/m1/2/: accessed February 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.