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TECHNICAL PAPERS

Test Results for PTFE-Faced Thrust Pads, With Direct Comparison Against Babbitt-Faced Pads and Correlation With Analysis

[+] Author and Article Information
C. M. Ettles

Tribology Group, Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590e-mail: ettlec@rpi.edu

R. T. Knox

Michell Bearings Ltd, Scotswood Road, Newcastle-upon-Tyne, NE15 6LL, UKe-mail: KNOX-R@michellbearings.co.uk

J. H. Ferguson

GE Hydro, General Electric Canada Inc, 107 Park Street North, Peterborough, Ontario K9J 7B5, Canadae-mail: james.ferguson@ps.ge.com

D. Horner

Michell Bearings Ltd, Scotswood Road, Newcastle-upon-Tyne, NE15 6LL, UKe-mail: HORNER-D@michell.bearings.co.uk

J. Tribol 125(4), 814-823 (Sep 25, 2003) (10 pages) doi:10.1115/1.1576427 History: Received March 12, 2002; Revised August 09, 2002; Online September 25, 2003
Copyright © 2003 by ASME
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References

Figures

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Creep properties of pure PTFE in compression at 100°C
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(a) Dimensions of pads in bearing #1; (b) tapers on lead and trail edges; and (c) edge support in bearing #2
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(a) Measured and computed temperatures in bearing #1 at location “a” (Fig. 2(a)) at the 57%, 84% radial/circumferential position. Speed 800 rpm, bath temperature 49–51°C. Results for location “a” with the thermocouple encapsulated in PTFE are shown as half-filled symbols, in the range 51–58°C; and (b) measured and computed power loss at 800 rpm.
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Comparison of measured power loss for two designs of PTFE-faced pads and for babbitt-faced pads in bearing #1 configuration at 6–7 MPa, bath temperature 49–51°C
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(a) Computed film profiles on the mean radius for bearing #1 with PTFE face; and (b) corresponding pressure profiles
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Illustration of end constriction found by Rightmire et al. 10, reproduced from the ASME Journal of Lubrication Technology, with acknowledgements
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Computed isobars of pad face temperature, pressure and film thickness for bearing #1: (a, b, c) PTFE-faced, 2.9 MPa, 800 rpm; and (d, e, f) Babbitt-faced, 9.0 MPa, 800 rpm.
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Bearing #2: (a) Babbitt-faced: Measured and computed temperatures at 5 MPa for locations a,b,c. The measured values are shown as filled symbols and computed values as open symbols. (The locations a,b,c,d are 21 mm from the back face, at the nondimensional radial/circumferential positions (%,%) 61–85, 89–67, 13–22, 61–63); and (b) PTFE-faced: Measured and computed temperatures at locations a,d at 5 MPa (Measured values—filled symbols; computed values—open symbols. The “maximum local” face temperature occurred at the 100–100 location).
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Temperature distribution through the thickness of the pads for the PTFE and babbitt-faced pads at the 50–88 position for 5 MPa and 300 rpm
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Measured and computed power loss for bearing #2 at 5 MPa, with PTFE and babbitt-faced pads
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Computed isobars of pad face temperature, pressure and film thickness for bearing #2: (a, b, c) PTFE-faced, 4.6 MPa, 300 rpm; and (d, e, f) Babbitt-faced, 5.0 MPa, 300 rpm
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Computed isobars of pad face temperature, pressure and film thickness with allowance for the erosion channel extending from the oil lift hole; at 2.8 MPa and 300 rpm
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Profilometer traces 1,2 across a pad of bearing #1
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Schematic of possible flow of PTFE and the development of locally crowned areas
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Schematic of pad face of bearing #1, showing position of traces 1,2 and eroded areas

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