Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Study on the Behavioral Characteristics of Bellows for Expansion Joints

신축이음용 벨로우즈의 거동특성에 관한 연구

  • Jeong, Doo-Hyung (Kyungdong Navien Co., Ltd, R&D Center) ;
  • Chin, Do-Hun (Dept. of Industrial Health, Catholic University of Pusan) ;
  • Kim, Byung-Tak (Dept. of Mechanical Design Engineering, Pukyong National University)
  • 정두형 (경동나비엔 기술연구소) ;
  • 진도훈 (부산가톨릭대학교 산업보건학과) ;
  • 김병탁 (부경대학교 기계설계공학과)
  • Received : 2020.04.17
  • Accepted : 2020.07.06
  • Published : 2020.10.31
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Abstract

Bellows are corrugated mechanical elements used to absorb displacements or vibrations caused by temperature changes, pressure, earthquakes, waves, etc., which are welded to flanges or directly connected to pipes. Expansion joint bellows must not only be designed to sufficiently withstand the internal pressure of the pipes but also accommodate axial, transverse, and rotational deformations to minimize the transfer of forces to the sensitive components of the system. Bellows have various types of corrugations, but U-type bellows are most commonly used in general piping systems. In this study, the behavior of U-shaped one-, two-, and three-ply bellows with the same inner diameter under pressure and forced displacement was analyzed using the finite element method. The results were compared with the design formula in the Expansion Joint Manufacturers Association (EJMA)'s code. Manufacturer data were used for the applied pressure and force displacement. The behavioral characteristics of the three cases were compared via structural analysis because the stress levels will be different for each model, even if they have the same inner diameter. Since the analytical model has an axisymmetric shape but displacement occurs in the transverse direction, the finite element model was composed of 1/2 of the whole model, and ANSYS Workbench 17.2 was employed for the analysis.

Keywords

References

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