Abstract
The use of bellows expansion joints is an effective measure to rationalize various piping systems in industry. In the structural design, the requirements for prohibiting failures such as ratchetting, fatigue and buckling should be satisfied. The mechanisms of some failure modes of bellows are different from those of the ordinary vessels and piping components. It is a particularly unique characteristic that bellows buckle under internal pressure. The author has proposed an evaluation method for this failure mode in the elastic plastic region. However, in the case of high-temperature operation the creep buckling strength shound be considered. In this paper a simplified theoretical method for evaluating the critical time of creep buckling of bellows under constant internal pressure is proposed. In this method Norton's law is introduced to express material creep characteristics, and the meridional bending stress is assumed to be dominant.
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