A secondary torque, i.e., re-torque, is generally applied in order to confer long term bolt tightness of certain gasketed-flange configurations that have undergone a primary torque with some relaxation. In some sense, the initial torque conditions the viscoelastic gasket material for long term performance under service loading. While prior research has been carried out to analytically model the mechanical response of gasket materials under either creep, stress relaxation, or creep relaxation, the mechanics of gasket re-torque has received much less attention. In the current study, a candidate fiber-glass reinforced gasket material is subjected to creep relaxation after a series of primary and secondary torques. Test variables considered here include values of either torque, dwell period, or gasket thickness. The over-arching goal addressed in this study is the identification of the conditions that confer the minimal initial dwell period without loss of long term load retention. In all cases, specimen-sized samples were used on a raised-face, serrated flange assembly. Based on the experimental test data and observations from scanning electron microscopy, an viscoelasticity model is developed to analytically predict the response of the time-dependent solid.
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ASME 2011 Pressure Vessels and Piping Conference
July 17–21, 2011
Baltimore, Maryland, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4456-4
PROCEEDINGS PAPER
Analytical Modeling of the Mechanics of Re-Torque
Ali P. Gordon,
Ali P. Gordon
University of Central Florida, Orlando, FL
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James Williams,
James Williams
University of Central Florida, Orlando, FL
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Maricela De Santiago
Maricela De Santiago
Lockheed Martin Aeronautics Company, Marietta, GA
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Ali P. Gordon
University of Central Florida, Orlando, FL
James Williams
University of Central Florida, Orlando, FL
Maricela De Santiago
Lockheed Martin Aeronautics Company, Marietta, GA
Paper No:
PVP2011-57718, pp. 1135-1143; 9 pages
Published Online:
May 21, 2012
Citation
Gordon, AP, Williams, J, & De Santiago, M. "Analytical Modeling of the Mechanics of Re-Torque." Proceedings of the ASME 2011 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Baltimore, Maryland, USA. July 17–21, 2011. pp. 1135-1143. ASME. https://doi.org/10.1115/PVP2011-57718
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