Impact of expansion pressure on wall thinning and contact pressure for hydraulically expanded tube-to-tubesheet joints: Numerical analysis

Dinu Thomasthekkuden, Abdel Harnid I. Mourad, Abdel Hakim Bouzid, Tariq Darabseh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The design of the tube-to-tubesheet joints is very critical to the functioning of the heat exchangers. In an expansion process, the pressure that is applied on the inner tube surface causes the tube to deform radially outward. Further plastic deformation of the tube, while tube in contact with the tubesheet, creates a contact pressure at the interface. Therefore, an optimum expansion pressure adequately develops sufficient contact pressure at the tube-to-tubesheet interface. Wall thinning percentage is generally used in practice to estimate the right amount of expansion. This paper focusses on the wall thickness reduction expressed in percentage, radial displacement of the inner tube surface, contact pressure and theoretical pull-out force for a various expansion pressure range. Results show that an expansion pressure lower than the yield stress of the tube does not fully close the gap between the tube and tubesheet. There is an evident spring back of radial displacement and contact pressure due to bauschinger effect upon retrieving the expansion pressure. However, the maximum radial displacement and contact pressure increase as expansion pressure increases. All the expansion pressures above the tube yield stress were sufficient to close the initial gap of the tube-to-tubesheet joint. A sudden increase in the radial displacement was observed for expansion pressures above tubesheet yield stress. Expansion pressure from 240 MPa to 340 MPa resulted in wall thinning percentage of 1.15% to 2.97%. Since the pullout strength and contact pressure are interrelated, high expansion pressure resulted in greater pull-out strength.

Original languageEnglish
Title of host publication2020 Advances in Science and Engineering Technology International Conferences, ASET 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728146409
DOIs
Publication statusPublished - Feb 2020
Event2020 Advances in Science and Engineering Technology International Conferences, ASET 2020 - Dubai, United Arab Emirates
Duration: Feb 4 2020Apr 9 2020

Publication series

Name2020 Advances in Science and Engineering Technology International Conferences, ASET 2020

Conference

Conference2020 Advances in Science and Engineering Technology International Conferences, ASET 2020
Country/TerritoryUnited Arab Emirates
CityDubai
Period2/4/204/9/20

Keywords

  • Contact pressure
  • Expansion pressure
  • Numerical analysis
  • Tube
  • Tubesheet

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering
  • Mechanical Engineering
  • Waste Management and Disposal
  • Process Chemistry and Technology
  • Artificial Intelligence
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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