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RESEARCH PAPERS

Adhesive Effects on Dynamic Friction for Unlubricated Rough Planar Surfaces

[+] Author and Article Information
Xi Shi

Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Andreas A. Polycarpou1

Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801polycarp@uiuc.edu

1

Corresponding author.

J. Tribol 128(4), 841-850 (Jun 01, 2006) (10 pages) doi:10.1115/1.2345392 History: Received March 02, 2004; Revised June 01, 2006

As the size of contacting and sliding tribosystems decrease, intermolecular or adhesive forces become significant partly due to nanometer size surface roughness. The presence of adhesion has a major influence on the interfacial contact and friction forces as well as the microtribosystem dynamics (microtribodynamics) and thus influences the overall dynamic friction behavior. In this paper, a dynamic friction model that explicitly includes adhesion, interfacial damping, and the system dynamics for realistic rough surfaces was developed. The results show that the amplitude and mean value of the time varying normal contact and friction forces increase in the presence of adhesion under continuous contact conditions. Also, due to the attractive nature of adhesion, its presence delays or eliminates the occurrence of loss of contact. Furthermore, in the presence of significant adhesion, dynamic friction behavior is significantly more complicated compared to the no adhesion case, and the dynamic friction coefficient predictions may be misleading. Thus, it is more appropriate to discuss dynamic friction force instead of dynamic friction coefficient under dynamic conditions.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Adhesive force components for a rough multiasperity interface, simulation parameter set II, Δγ=0.5N∕m. (a) Contributions from contacting and noncontacting asperities and (b) contributions from attractive and repulsive adhesive components.

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Figure 2

Dynamic system model of a rough contacting pair with friction: (a) mass block showing relevant interfacial forces and (b) lumped parameter dynamic friction model with adhesion

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Figure 3

Numerical and curve-fitted total adhesive force for a rough multiasperity interface, simulation parameter set I, Δγ=1N∕m

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Figure 4

Interfacial forces for a rough multiasperity interface under static contact conditions (simulation parameter set I, Δγ=1N∕m): (a) adhesion Fso, contact force Po, tangential force Qo versus external force Fo and (b) static friction coefficient μo versus external force Fo

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Figure 5

Effect of adhesion on interfacial parameters under dynamic contact conditons (simulation parameters set I, α=0.05, ζ=0.01)

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Figure 6

Effect of adhesion on interfacial parameters under dynamic contact conditions (simulation parameters set I, α=0.1, ζ=0.01)

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Figure 7

Normalized mean dynamic interfacial force decreases under different adhesion levels (a)–(c), and under different damping levels (d)–(f) (simulation parameters set II)

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Figure 8

Dynamic friction force, Q versus total external force, F: (a) no adhesion and varying damping and (b) high adhesion and varying damping (simulation parameters set I, α=0.05)

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Figure 9

Dynamic friction coefficient, μ versus total external force, F: (a) no adhesion and varying damping and (b) high adhesion and varying damping (simulation parameters set I, α=0.05)

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Figure 10

Normalized mean dynamic friction coefficient increase (Δμn) under different adhesion levels: (a)ζ=0; (b)ζ=0.01; (c)ζ=0.05 (simulation parameters set II)

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Figure 11

Transfer function estimate between friction force Q and interfacial normal force Pd (simulation parameters set II, α=0.1, ζ=0.05)

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Figure 12

Coherence between friction force Q and interfacial normal force Pd (simulation parameters set II, α=0.1, ζ=0.05)

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