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http://dx.doi.org/10.20466/KPVP.2018.14.1.032

Prediction of Creep Stress in High Temperature Piping System Using Elastic Follow-up Factor  

Seo, Jun-Min (고려대학교 (기계공학과))
Youn, Gyo-Geun (고려대학교 (기계공학과))
Lee, Hyun-Jae (고려대학교 (기계공학과))
Oh, Young-Jin (한국전력기술 (미래전력기술연구소))
Kim, Yun-Jae (고려대학교 (기계공학과))
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.14, no.1, 2018 , pp. 32-37 More about this Journal
Abstract
When designing high temperature piping system, creep phenomena must be considered. Since ASME code does not provide detailed methods of design by rule (DBR) for high temperature piping, Finite element analysis should be performed. However, In the case of piping system with frequent design changes, creep analysis of the entire piping system for every change is ineffective and practically impossible. Therefore, based on elastic and elastic-plastic analysis, which takes a relatively short time, the creep stress is predicted by using elastic follow-up factor method provided in R5 code and plastic-creep analogy presented by Hoff. The predicted creep stress for a virtual piping system was compared with the creep analysis result and the two results showed similar stress relaxation tendency in time.
Keywords
PGSFR, Elastic follow-up factor; Plastic-creep analogy; Creep stress; Stress relaxation;
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