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TECHNICAL PAPERS

Dynamic Friction Measurements at Sliding Velocities Representative of High-Speed Machining Processes

[+] Author and Article Information
H. D. Espinosa, A. J. Patanella, M. Fischer

Purdue University, 1282 Grissom Hall, West Lafayette, IN 47907-1282

J. Tribol 122(4), 834-848 (Apr 17, 2000) (15 pages) doi:10.1115/1.1310331 History: Received March 16, 1999; Revised April 17, 2000
Copyright © 2000 by ASME
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References

Figures

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Drawing of the stored-torque torsional Kolsky Bar Apparatus. Each gauge station has full strain gage bridge arrangement to measure torsional loads (with an alignment of 45 deg respect to the longitudinal axis of the bar) and to measure axial load (aligned parallel to the longitudinal axis of the bar), except for the bending station (half bridge) which monitors the presence of any spurious bending wave transmitted through the specimen.
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Photograph of the stored-energy Kolsky bar apparatus
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(a) Schematic of radial velocity distribution; (b) pressure distribution, along the contact area, measured by means of a pressure sensitive film
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Sample of roughness analysis with the atomic force microscope DI 3100A
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Recorded data at four gauge stations
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Time evolution of friction coefficient and sliding velocity
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Schematic of two surfaces in quasi-static contact sliding one against each other, Ludema 27
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Friction coefficient as a function of sliding distance
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AFM micrograph of the contact area on A16061-T6 after sliding on Steel 1080 at 3.1 m/s. Surface height is given by the bar scale in the range 0–3000 nanometers.
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Surfaces characteristics before and after the experiment. Al 6061-T6 sliding against Steel 1080 at 3.1 m/s. Image statistics performed along black lines.
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Surfaces characteristics before and after the experiment. Ti 6Al-4V sliding against Steel 1080 at 3.75 m/s.
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Surfaces characteristics before and after the experiment. Al 6061-T6 rough sliding at 3.1 m/s against Al 7075-T6 mirror polished.
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Friction coefficient versus time for Al6061-T6 sliding at 3.1 m/s on Al7075-T6 mirror-polished
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Friction surfaces for Al6061-T6 sliding against Al7075-T6 mirror-polished and rough-finished
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Friction specimen: (a) disk attached to the incident bar; (b) disk attached to the transmitted bar
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(a) Lagrangian X-t diagram of friction experiment with quasi-static axial load and dynamic torque; (b) Lagrangian X-t diagram of friction experiment with specimen subjected to a single compression-shear pulse.

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