Mathematical optimization of containment/deflection system would save time, effort, and material as well as afford designer greater opportunity to investigate new ideas and variety of materials

Witmer, E. A.

Wu, R. W.

English

NASA Technical Reports Server

May 1973	 B73-10064 
NASA TECH BRIEF 
Lewis Research Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on' a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington. D:C. 20546. 
Computer Program for Transient Response of 
Structural Rings Subjected to Fragment Impact 
This computer program (JET 3) predicts the transient 
responses of a complete or partial ring with various 
support conditions and restraints. The ring may be 
subjected to arbitrary distributions of initial impulse 
loading and/or externally-applied time-dependent forces. 
The geometrical shapes of the structural ring can be 
simple, circular or arbitrarily curved and with variable 
thickness along the circumferential direction. Strain-
hardening and strain-rate sensitive material behavior are 
taken into account. 
The computerized model can be used by designers 
'
who, knowing the physical, operational, and environ-
mental characteristics of a turbomachine and a proposed 
containment/deflection system, could mathematically 
evaluate the combined package, under a variety of 
possible burst attacks, on the computer (assuming that 
one has an adequate description of the forces which the 
fragments apply to the containment ring), instead of in a 
spin chamber. The mathematical optimization of a con- 
tainment/deflection system would save a great deal of 
time, effort, and material as well as afford the designer a 
greater opportunity to investigate new ideas and a variety 
of materials.
Notes: 
1. This is the third in a series of computer programs 
which are available for use in analyzing structures such 
as protective rings to contain/deflect fragments 
generated by burst engine rotors. Each of these 
programs requires that the forces applied to the 
structure be prescribed. The two earlier programs are 
also available from COSMIC (address below), 
References: LEW-1 1389 and LEW-1 1668. 
2. The program is written in FORTRAN IV for the IBM 
370/155. 
3. Inquiries concerning this program should be directed 
to:
COSMIC 
Information Services 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30602 
Reference: LEW-1 1926 
Source: R.W-H. Wu and E.A. Witmer 
Massachusetts Institute of Technology
under grant by
Lewis Research CenteF
(LEW-1 1926) 
Category 09 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that Such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Computer program for transient response of structural rings subjected to fragment impact

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