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research-article

Glass Fiber-Reinforced PTFE Gasketed-Joint Under a Re-torque

[+] Author and Article Information
James Williams

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL USA
jwghw@knights.ucf.edu

Addi-Neequie Stone

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL USA
addi_stone@knights.ucf.edu

Ryan Reedy

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL USA
r.reedy@Knights.ucf.edu

Ali Gordon

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL USA
apg@ucf.edu

1Corresponding author.

ASME doi:10.1115/1.4042219 History: Received February 05, 2017; Revised December 06, 2018

Abstract

Joints gasketed with viscoelastic seals often receive an application of a secondary torque, i.e., re-torque, in order to ensure joint tightness and proper sealing. The importance of understanding gasketed joint behavior under various loading conditions and test parameters is paramount to a successful design. The motivation of this study is to characterize and analytically model the initial and re-torque load relaxation response of a single 25% glass-fiber reinforced polytetrafluorethylene (PTFE) gasket-bolted joint with serrated flange detail by a single set of experimentally determined modeling constants. The Burger-type viscoelastic modeling constants of the material are obtained through optimization from a baseline load relaxation data and compared to a variety of test cases for both initial and re-loadings. Determination of a re-torque parameter, a, allowing modeling constants identified from an initial loading to predict the re-torque relaxation showed the retarded elasticity or K2 term to be most influential in predicting re-torque response. Finally, the validity of the viscoelastic model with the re-torque parameter is shown to reasonably predict re-torque relaxation responses of all test cases investigated.

Copyright (c) 2018 by ASME
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