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TECHNICAL PAPERS

Measurement of Tangential Contact Hysteresis During Microslip

[+] Author and Article Information
Sergio Filippi, Adnan Akay

Mechanical Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213

Muzio M. Gola

Mechanical Engineering Department, Politecnico di Torino 10129 Turin, Italy

J. Tribol 126(3), 482-489 (Jun 28, 2004) (8 pages) doi:10.1115/1.1692030 History: Received September 17, 2002; Revised July 01, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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References

Figures

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Rotation of the specimens
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Setup contact mechanism scheme: T=tangential contact force (reaction force in the hinge), T2=secondary contact tangential force (reaction force in the second hinge), N=normal load (applied by means of a dead weight)
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Stationary mechanism in contact with the beam
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Schematic of how a preload and a small rotation modify the normal load
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Application of contact normal load N by means of calibrated dead weights
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Forces acting on the force transducer
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Forces transmitted by the rolling bearing ball to the support attached to the force transducer (a=5.5 mm)
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Forces acting on the stationary mechanism in the plane of the two beam axes
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Alignment errors for the mechanism
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Mechanism rotation in its plane
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Friction specimens and the points where the relative measurements are made with the two laser beams
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Hysteresis cycles measured by changing the position of the laser beam spots. The dotted line is the slope of the hysteresis cycle corrected by taking in account for the specimens rotations. Normal load: 5kgF (49 N); excitation frequency: 5 Hz
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Hysteresis cycles for different relative displacement amplitudes, normal load: 7kgF (69 N); excitation frequency: 50 Hz
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Ratio of tangential force to normal force as function of relative displacement, normal load: 7kgF (69 N); excitation frequency: 50 Hz
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Contact stiffness calculated from measured data and its standard deviation (bars) compared to the contact stiffness calculated by means of the elastic contact mechanics

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