Numerical Estimate of Elastic Follow-Up in Piping: Inelastic Evaluation

[+] Author and Article Information
A. K. Dhalla

Westinghouse Advanced Energy Systems Division, Madison, Pa. 15663

J. Pressure Vessel Technol 108(4), 453-460 (Nov 01, 1986) (8 pages) doi:10.1115/1.3264812 History: Received April 17, 1985; Revised December 04, 1985; Online November 05, 2009


Large-diameter thin-walled piping such as that used in the Liquid Metal Fast Breeder Reactor (LMFBR) plant is characterized by relatively stiff straight pipes welded to flexible elbows. According to Robinson [1] , such a piping system configuration may experience elastic follow-up during elevated temperature operation. Therefore, ASME Code Case N-47 requires that the secondary thermal expansion stress “. . . with large amounts of elastic follow-up . . .” be considered a load-controlled primary stress. A procedure to calculate the extent of potential elastic follow-up and thereby classify the thermal expansion stress as either primary or secondary is presented here. The elastic follow-up effect is investigated in detail by evaluating spatial and temporal redistribution of loads and inelastic strains computed for a typical LMFBR piping system.

Copyright © 1986 by ASME
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