Total views : 174

Study of the Stress Distribution Around a Micro Hole on a Flexible Tube under Lateral Deflection with a Positive Rotation Angle Towards the Micro Defect


  • Department of Aeronautical and Mechanical Engineering, Hanseo Univesity, 32158, Korea


Objectives: This study was conducted for the effects of micro holes to stress distribution acting on bellows under lateral deflection with a positive rotation angle toward the micro defect. Methods/Statistical Analysis: Stress was analyzed by F.E.M. (Finite Element Method) and the chosen mesh consisted of 112,800 elements or more. Shell element and nonlinear method were used. The micro hole was located at the top of the first root of the neck. Findings: The results show that the stress in the bellows is affected by not only non-symmetrical deformation but also by a combination of the rotation angle and the deflection deformation of the hole as well as the micro hole. The elastic-plastic range around the hole and its relation to the upward lateral deflection and the positive rotation angle was obtained for the bellows in this study. Improvements/Applications: The results are important as they identify the relation between a micro hole and the deformation conditions, and it can be used to improve the quality of bellows.


Angular Movement, Flexible Tube, Lateral Displacement, Micro Hole, Stress Distribution.

Full Text:

 |  (PDF views: 148)


  • Kim SC, Jang BC. Development of bellows design software using MATLAB. Indian Journal of Science and Technology. 2015 Apr; 8(8):201–6.
  • Standards of the Expansion Joint Manufacturers Association, 9th (edn)., EJMA, NY; 2009. p. 1–239.
  • Hanna JW. A comparison of the ASME appendix BB to the EJMA standards. The ASME Pressure Vessels and Piping Conference; 1989 Jul. p. 79–85.
  • Han MS, Ahn JH, Yang CH. Study on optimum shape of expansion joint. Transaction of KSAE. 2013 Mar; 21(2):154–8.
  • Chien WZ, Wu MD. The nonlinear characteristics of U-shaped bellows-calculations by the method of perturbation. Applied Mathematics and Mechanics. 1983 May; 4(5):649–5.
  • Hamada M, Nakagawa K, Miyata K. Bending deformation of U-shaped bellows. Bulletin of the Japan Society of Mechanical Engineers. 1971; 14(71):401–9.
  • Hu HX, Zhen YG, Liu CB. Predicting the preferential sites to liquid droplet erosion of the bellows assemblies by CFD. Nuclear Engineering and Design. 2011; 241(6):2295–3006.
  • Satoshi I, Hiroshi K, Masanori K. Evaluation of mechanical behavior of new type bellows with two-directional convolutions. Nuclear Engineering and Design. 2000 Apr; 197(1–2):107–14.
  • Kim JB. The effects of convolution geometry and boundary condition on the failure of bellows. Indian Journal of Science and Technology. 2015 Jan; 8(1):462–6.


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.