Hydro-thermo-mechanical analysis on high cycle thermal fatigue induced by thermal striping in a T-junction

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• 作者：Sun-Hye Kim (1) (2)
  Nam-Su Huh (3)
  Moon-Ki Kim (4)
  Dae-Geun Cho (1)
  Young-Hwan Choi (2)
  Jin-Ho Lee (2)
  Jae-Boong Choi (1) (4)
  
• 关键词：Fluid ; structure interaction problem ; One ; way separate analysis ; High cycle thermal fatigue ; Turbulent mixing ; Thermal striping striping
• 刊名：Journal of Mechanical Science and Technology
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：27
• 期：10
• 页码：3087-3095
• 全文大小：6303KB
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• 作者单位：Sun-Hye Kim (1) (2)
  Nam-Su Huh (3)
  Moon-Ki Kim (4)
  Dae-Geun Cho (1)
  Young-Hwan Choi (2)
  Jin-Ho Lee (2)
  Jae-Boong Choi (1) (4)
  
  1. Department of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-726, Korea
  2. Korea Institute of Nuclear Safety, Daejeon, 305-338, Korea
  3. Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul, 139-746, Korea
  4. SKKU Advanced Institute of Nanotechnology, Suwon, 440-726, Korea
  
• ISSN：1976-3824

文摘

Turbulent mixing in a T-junction causes thermal striping which is irregular and frequent fluctuation of thermal layer. Thermal striping is a significant thermal problem because it causes unpredicted high cycle thermal fatigue and fatigue cracking in piping systems. Since this phenomenon is hardly detected by common plant instruments due to high frequency and complex mechanism, numerical approaches are indispensable for a precise evaluation. This research was carried out to define a suitable and effective numerical method for evaluating thermal stress and fatigue induced by thermal striping. A three-dimensional hydro-thermo-mechanical analysis was performed based on one-way separate analysis method to find out the characteristics of stress components and its results were compared to the results of a one-dimensional simplified analysis. It was found that the detailed three-dimensional analysis is indispensable because one-dimensional simplified analysis can overestimate or underestimate according to the assumed heat transfer coefficient and cannot estimate the considerable mean stress effects.