Dynamic Behavior of Elastic-Plastic Simply Supported Pipes

[+] Author and Article Information
J. S. Gau

Gencorp Research, Akron, OH 44305

R. J. Scavuzzo

The College of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH 44325

P. C. Lam

The Department of Mechanical Engineering, The University of Akron, Akron, OH 44325

J. Pressure Vessel Technol 116(3), 306-311 (Aug 01, 1994) (6 pages) doi:10.1115/1.2929593 History: Received October 11, 1990; Revised March 10, 1994; Online June 17, 2008


Nonlinear responses of the dynamic behavior of simply supported pipes were analyzed using a nonlinear finite element program. In the first model, a 1 1/2-in. schedule 40 stainless steel pipe 48 in. long was studied. An elastic-plastic material was specified. The dynamic response of the pipe to a sinusoidal force input was calculated. There was no internal pressure and the magnitude of the force input was held constant as the frequency was varied. A total of 26 cases were studied starting with low frequencies that exhibited static behavior to twice the natural frequency. In addition, a 1-in. straight piping system studied experimentally by Beaney (1985a, b) was modeled analytically. Calculations are compared to experiment. The response of the piping at input frequencies of one-quarter and one-half of the natural frequency exhibited resonance behavior. At one forced frequency, an almost chaotic behavior of the dynamic pipe response was observed. However, at all other specified excitation frequencies, the system reaches a steady-state response. Output in the form of strain and displacement time histories and force displacement plots is developed. In addition, both work and equivalent viscous damping are calculated and presented.

Copyright © 1994 by The American Society of Mechanical Engineers
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