Computer program simulates specific bulkhead fittings by subjecting the desired geometry configuration to a membrane force, an external force, an external moment, an external tank pressure, or any combination of the above. This program generates a general model of bulkhead fittings for the Saturn booster

Bertrand, A. R.

English

NASA Technical Reports Server

December 1967	 Brief 67-10520 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Computer Program Performs Rectangular Fitting Stress Analysis 
A computer program has been designed to simu-
late specific bulkhead fittings by subjecting the desired 
geometry configuration to a membrane force, an 
external force, an external moment, an internal tank 
pressure, or any combination of the above. Forces and 
moments resulting from the above loads are con-. 
sidered as well as forces and moments imposed by 
geometry deformations. 
This program generates a general model of bulk-
head fittings for the Saturn Boosters. The fitting is 
free-bodied at each point of discontinuity and is com-
posed of the following segments: (I) the booster 
bulkhead on which the fitting is welded, (2) outer 
annular ring or interstep between the bulkhead and 
the thickest part of the fitting, (3) inner annular 
ring, (4) ring boss which serves as a rigid mount for 
line flanges, and (5) an internal or external cylinder 
bolted to the ring. 
The theory of strain compatibility is utilized in writ-
ing the discontinuity equations, which represent rela-
tions between deflections and rotations of adjacent 
components of the fitting. The solutions to these 
equations are found by P. D. Crout's elimination 
method for solutions of linear simultaneous equa-
tions. The solutions are used to compute stresses and
margins of safety for various components of the fit-
ting. 
Notes: 
I. The program is written in Fortran II language for 
the IBM 7094 computer. 
2. The program should have wide uses in the aero-
space industry and other industries engaged in the 
manufacture of tanks, and other similar equip-
ment, where bulkhead fittings are present. 
3. Inquiries concerning this program may be ad-
dressed to: 
COSMIC 
Computer Center 
University of Georgia 
Athens, Georgia 30601 
Reference: B67-10520 
Patent status: 
No patent action is contemplated by NASA. 
Source: A. R. Bertrand 
of The Boeing Company 
under contract to 
Marshall Space Flight Center 
(MFS-13010) 
Category 06 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19670000519 2020-03-11T20:56:02+00:00Z


Computer program performs rectangular fitting stress analysis

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