Evaluation of Accumulated Fatigue in Metals Due to Random Oscillating Thermal Stresses

[+] Author and Article Information
I. Klevtsov

Thermal Power Laboratory, Tallinn Technical University, Tallinn, Estonia

R. Crane

Mechanical Engineering Department, University of South Florida, 4202 East Fowler Avenue, ENG 118, Tampa, FL 33620-5350

J. Pressure Vessel Technol 120(1), 43-50 (Feb 01, 1998) (8 pages) doi:10.1115/1.2841883 History: Received February 20, 1994; Revised August 01, 1997; Online February 11, 2008


A direct modeling calculation method was developed to improve the accuracy of metal fatigue life estimates. The procedures were developed for the evaluation of once-through steam generator tubes, but were intended to be generally applicable. Random thermal boundary conditions were first simulated, with specific consideration given to the cases of transition boiling and fluctuating coolant inlet temperatures. Subsequently, transient heat transfer rates were determined and wall stresses due to pressure and temperature oscillations were calculated. The resultant wall temperature and stress oscillation data were statistically analyzed to provide the effective parameters used to estimate the metal fatigue.

Copyright © 1998 by The American Society of Mechanical Engineers
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