The Use of Ultrasound in the Investigation of Rough Surface Interfaces

[+] Author and Article Information
R. S. Dwyer-Joyce

Department of Mechanical Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD England

B. W. Drinkwater, A. M. Quinn

Department of Mechanical Engineering, Queens Building, University of Bristol, Bristol, BS8 1TR England

J. Tribol 123(1), 8-16 (Sep 21, 2000) (9 pages) doi:10.1115/1.1330740 History: Received March 14, 2000; Revised September 21, 2000
Copyright © 2001 by ASME
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Schematic diagram of ultrasound reflection measuring apparatus
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Measured variation of the aluminum-steel reflection coefficient with frequency for a range of nominal contact pressures
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The stiffness of an interface, as measured by ultrasonic reflection, is shown to be frequency independent
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Schematic diagram of the modeling of a contacting interface as an array of penny shaped cracks
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Reflection coefficient variation with percentage contact for different interfacial gap sizes as predicted using the crack model shown schematically in Fig. 4. Note that w is the width of the gaps and s is their spacing.
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Interface stiffness determined during three cycles of loading on an aluminum-steel interface. The first loading is plastic: subsequent loading and unloadings are largely elastic but also exhibit some hysteresis.
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Sketches representing the interface stiffness/pressure relationships for a series of idealized cases (a) no further plasticity after first loading, (b) successive plasticity on reloading, i.e., ratchetting, (c) no further plasticity but some other contact irreversibility, and (d) successive plasticity and contact irreversibility.
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Interface stiffness measured during a single loading cycle on specimen pairs of three different roughness. Each specimen pair was loaded to the same end nominal contact pressure.
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Series of loading and unloading cycles for three pairs of specimens. Each specimen pair was loaded to the same end reflection coefficient (and hence interface stiffness).
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Series of loading and unloading cycles for a single specimen pair. Each successive cycle has been carried to a greater final load.
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Predicted contact parameters calculated from the experimental data shown in Fig. 9: (a) average size of contact, and (b) number of contacts per unit area.
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Relationship between interface stiffness and nominal pressure for elastic contact. The Greenwood and Williamson (chain dash line), is compared to experimental unloading (solid lines) using the same dimensionless axes.
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Comparison between experiment (solid lines) and the interface stiffness predicted by the elastic numerical contact model of Webster and Sayles (dashed lines)




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