3-Dimensional Stress Analysis for Creep Life Assessment of Y-Piece Under Inner Pressure

내압을 받는 Y 배관의 크리프 수명 평가를 위한 3차원 응력해석

  • Shin, Kyu-In (Frontier Technology Innovation Center, Chung Ang University) ;
  • Lee, Jin-Sang (Department of Mechanical Engineering, Chung Ang University) ;
  • Yoon, Kee-Bong (Department of Mechanical Engineering, Chung Ang University)
  • 신규인 (중앙대학교 미래신기술연구소) ;
  • 이진상 (중앙대학교 기계공학부) ;
  • 윤기봉 (중앙대학교 기계공학부)
  • Published : 2007.04.30


To assess a creep life of elevated temperature plant components, inspections and analysis are usually focused on the critical locations. In this study, stress analysis of a weld region in branch part of Y-piece was conducted by using a three-dimensional finite element analysis. The stresses at the inner and outer surface in the weld part were estimated by using elastic and elastic-creep analysis. For the elastic-creep analysis two kinds of elastic-creep analysis was conducted. The one was assumed that base and weld material properties were same and the other was that material properties were different between base and weld metal. The material properties of base and weld metal were used from reference data. The results showed the stress relaxation level and its location. The result stresses are also compared with elastic stresses.


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