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Research Papers: Contact Mechanics

Experimental Investigation of Energy Dissipation in Presliding Spherical Contacts Under Varying Normal and Tangential Loads

[+] Author and Article Information
Ahmet Deniz Usta

Department of Mechanical Engineering,
University of Wisconsin-Madison,
1513 University Avenue,
Madison, WI 53706
e-mail: austa@wisc.edu

Sohan Shinde

Department of Mechanical Engineering,
University of Wisconsin-Madison,
1513 University Avenue,
Madison, WI 53706
e-mail: sshinde@wisc.edu

Melih Eriten

Department of Mechanical Engineering,
University of Wisconsin-Madison,
1513 University Avenue,
Madison, WI 53706
e-mail: eriten@engr.wisc.edu

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 3, 2016; final manuscript received February 13, 2017; published online June 7, 2017. Assoc. Editor: Liming Chang.

J. Tribol 139(6), 061402 (Jun 07, 2017) (7 pages) Paper No: TRIB-16-1304; doi: 10.1115/1.4036183 History: Received October 03, 2016; Revised February 13, 2017

Interfacial damping in assembled structures is difficult to predict and control since it depends on numerous system parameters such as elastic mismatch, roughness, contact geometry, and loading profiles. Most recently, phase difference between normal and tangential force oscillations has been shown to have a significant effect on interfacial damping. In this study, we conduct microscale (asperity-scale) experiments to investigate the influence of magnitude and phase difference of normal and tangential force oscillations on the energy dissipation in presliding spherical contacts. Our results show that energy dissipation increases with increasing normal preload fluctuations and phase difference. This increase is more prominent for higher tangential force fluctuations, thanks to larger frictional slip along the contact interface. We also show that the energy dissipation and tangential fluctuations are related through a power law. The power exponents we identify from the experiments reveal that contacts deliver a nonlinear damping for all normal preload fluctuation amplitudes and phase differences investigated. This is in line with the damping uncertainties and nonlinearities observed in structural dynamics community.

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Figures

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Fig. 1

Rigid spherical tip in contact with a deformable sample under combined normal and tangential loading

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Fig. 2

Representative surface roughness of the polyimide samples: (a) before an experiment, (b) after an experiment, and (c) the difference between pre- and post-scans over a 5 μm × 5 μm region in the center

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Fig. 3

Loading profiles in normal (a) and tangential (b) directions, and a sample steady-state hysteresis loop (c) in response to cyclic loading conditions

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Fig. 4

Unidirectional sliding experiment on polyimide with P = 1000 μN

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Fig. 5

Normal displacements imposed in pull-off tests

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Fig. 6

Cyclic indentation tests on polyimide

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Fig. 7

Pull-off force measurements on polyimide

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Fig. 8

Initial loading portions of presliding experiments on polyimide

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Fig. 9

Normal load versus tangential load profiles corresponding to the loading scenarios of: (a) no preload fluctuation, (b) LP difference, and (c) HP difference

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Fig. 10

Hysteresis loops from the eighth cycle of constant normal force presliding experiments for maximum tangential force amplitudes of: (a) 92 μN, (b) 126 μN, (c) 140 μN, and (d) 153 μN

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Fig. 11

Energy dissipation versus tangential force curves for different preload fluctuation and phase different levels

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