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The Effect of Area on the EN13555 Stress Relaxation (PQR) Properties of an Advanced ePTFE Gasket Tape

[+] Author Affiliations
Daniel C. Bissett

W.L. Gore & Associates, GmbH, Putzbrunn, Germany

Charlene Jones

W.L. Gore & Associates, Inc., Elkton, MD

Paper No. PVP2014-28940, pp. V002T02A021; 4 pages
doi:10.1115/PVP2014-28940
From:
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology and Bolted Joints
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4599-8
  • Copyright © 2014 by ASME

abstract

The effect of the effective area of an advanced ePTFE gasket on the EN13555[ 1 ] stress retention (PQR) properties was investigated. It was found that larger areas gave higher PQR values but the systems actually lost more force and gave lower final thickness values. This effect of higher PQR with higher force lost is explained mathematically, and the reason behind the thinner final gaskets is also explained. Further analysis shows that the force loss is linked to the ratio of effective area and stiffness, and this effect can be used to better estimate the PQR values of larger area gaskets.

Copyright © 2014 by ASME

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