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Research Papers: Lubricants

Friction Behavior of Poly (Vinyl Alcohol) Gel Against Stainless Steel Ball in Different Lubricant Media

[+] Author and Article Information
Yu-Song Pan, Xiao-Lin Chen

Department of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P.R.C.

Dang-Sheng Xiong1

Department of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P.R.C.xiongds@163.com

1

Corresponding author.

J. Tribol 130(3), 031802 (Jul 01, 2008) (5 pages) doi:10.1115/1.2908895 History: Received March 27, 2006; Revised October 11, 2007; Published July 01, 2008

The effects of different variables on the friction coefficient of poly(vinyl alcohol) (PVA) hydrogel and stainless steel ball counterpart were investigated by a ball-on-plate friction and wear tester. Factors included lubrication condition, sliding speed, diameter of stainless steel ball, and load. It is shown that the free water in PVA hydrogel has a good lubrication on the friction counterpart. The friction coefficients have little difference between dry and lubricated conditions during the initial test stage. With the time prolonged, friction coefficient of PVA hydrogel under dry condition sharply increased within a short time. Friction coefficient decreased with increasing sliding speed and diameter of stainless steel ball. The decrease in the friction coefficient in bovine serum was 55.38% while the sliding speed increased from 45rpmto225rpm. The friction coefficient increased as the load increased, and the effect was more conspicuous at low load region.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of friction device for hydrogel friction testing

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Figure 2

Friction coefficient against sliding time under different lubricants for PVA gel (sliding speed: 90rpm, load: 10N, stainless steel ball: 12mm)

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Figure 3

Effect of load on the friction coefficient under different lubrication conditions (stainless steel ball diameter: 12mm, sliding speed: 90rpm)

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Figure 4

Effect of load on the deformation depth and contact area (stainless steel ball diameter: 12mm, sliding speed: 90rpm)

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Figure 5

Effect of sliding speed on the friction coefficient (diameter of ball: 12mm, load: 10N)

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