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[en] Recently, a new type of ratcheting under thermal stress alone has been paid attention. The representative case is the thermal ratcheting caused by the movement of hot sodium level during operation in the reactor vessel of FBR. In this paper, the effect of moving distance of temperature distribution on ratcheting behavior is studied in order to develop more practical prediction equation applicable to the actual operating condition of FBR. An advanced prediction equation is proposed based on the theoretical study assuming the short travel of hot-spot-shaped temperature distribution. Predicted results by this equation correspond to analytical results by FEM and can conservatively estimate the experimental results which are obtained from the tests with several kinds of moving distance, type of temperature hold and stress level for Type 316 and 316FR stainless steels
Source
Garud, Y.S. (ed.); 301 p; ISBN 0-7918-0993-5; 
; 1993; p. 81-88; American Society of Mechanical Engineers; New York, NY (United States); 1993 pressure vessel and piping conference; Denver, CO (United States); 25-29 Jul 1993; The American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10017 (United States)
; 1993; p. 81-88; American Society of Mechanical Engineers; New York, NY (United States); 1993 pressure vessel and piping conference; Denver, CO (United States); 25-29 Jul 1993; The American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10017 (United States)