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Simulation of Creep/Relaxation Behavior in Bolted Flange Joints Based on 3-D Viscoelasticity Model of Gasket

[+] Author Affiliations
Atsushi Yamaguchi, Takashi Honda

National Institute of Industrial Safety, Japan, Kiyose, Tokyo, Japan

Hirokazu Tsuji

Tokyo Denki University, Chiyoda, Tokyo, Japan

Paper No. PVP2009-77610, pp. 185-191; 7 pages
doi:10.1115/PVP2009-77610
From:
  • ASME 2009 Pressure Vessels and Piping Conference
  • Volume 2: Computer Applications/Technology and Bolted Joints
  • Prague, Czech Republic, July 26–30, 2009
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4365-9 | eISBN: 978-0-7918-3854-9
  • Copyright © 2009 by ASME

abstract

It is well known that an axial bolt force which tightens a gasket decreases due to a creep of non-asbestos gaskets. A bolted flange joint contains a combined condition of the creep/relaxation. A reduction behavior of a tightening pressure due to an effect of creep/relaxation is related to lifetime assessment of the non-asbestos gasket, and a leakage prevention of internal fluid. In this research, the creep/relaxation of the bolted flange joint using the non-asbestos gasket is measured. The compressed creep test is carried out using four-inch flanges and non-asbestos compressed fiber sheet gaskets. The test conditions are room temperature and 90 hours. The result of creep/relaxation is evaluated by 3-D viscoelasticity model. The creep/relaxation that was evaluated by 3-D viscoelasticity model and the Young’s modulus of the non-asbestos gaskets that was measured by the nanoindentation testing is applied to the FE analysis. FE model that include viscoelasticity is 1/16 of the test device. The stress state of the non-asbestos gasket was confirmed by the FE analysis. Then, the validity of creep/relaxation of the non-asbestos gaskets that was evaluated by the 3-D viscoelasticity model was shown by comparison with the experimental value and the analysis result.

Copyright © 2009 by ASME

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