Thermal Ratcheting Criteria and Behavior of Piping Elbows

[+] Author and Article Information
M. Ueda

CAD Center, HZS Corporation, Tokyo, Japan

T. Kano

Power Reactor and Nuclear Fuel Development Corporation, Tokyo, Japan

A. Yoshitoshi

Power Reactor and Nuclear Fuel Development Corporation, Ibaraki, Japan

J. Pressure Vessel Technol 112(1), 71-75 (Feb 01, 1990) (5 pages) doi:10.1115/1.2928590 History: Received October 11, 1984; Revised May 17, 1989; Online June 17, 2008


A thermal ratcheting test was performed using an elbow model test specimen subjected to sustained primary load and cyclic thermal transient strains. Under severe loading conditions incremental longitudinal strains are observed in the region where a circumferential angle is around ± π/9 from the side of the elbow, while the elbow cross section was ovalized cycle by cycle causing large circumferential bending strain at around φ = π/2. It was shown by the test and analyses that the maximum primary membrane stress in an elbow is an essential parameter for thermal ratcheting behavior of elbows. Direct application of thermal ratcheting criteria in the ASME Code Case N-47 showed considerable conservative estimation and an improved thermal ratcheting criterion for elbows is recommended.

Copyright © 1990 by The American Society of Mechanical Engineers
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