Assessment of Nominal Contact Area Parameters by Means of Ultrasonic Waves

[+] Author and Article Information
Francesco Aymerich

Massimiliano Pau

Department of Mechanical Engineering, University of Cagliari, Piazza d’Armi, 09123 Cagliari, Italy

J. Tribol 126(4), 639-645 (Nov 09, 2004) (7 pages) doi:10.1115/1.1760764 History: Received May 28, 2003; Revised March 18, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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Cross profile of the transducer impulse response for the 10 MHz focused probe employed in the experimental tests
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Schematic representation of the experimental setup. In the first stage the contact was tested by scanning the region with the ultrasonic probe: in the second stage, a sheet of pressure sensitive film was interposed between the sphere and the plate.
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Example of contact area visualization obtained from the ultrasonic test for the case ‘cylinder (500 mm diameter) versus rail’ contact 25
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Calculation procedure for the nominal contact area starting from the Fuji film stains: use of the whole binarized image.
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Calculation procedure for the nominal contact area starting from the Fuji film stains: use of the mean value of the diameter.
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Evolution of the contact diameter after the deconvolution processing of raw ultrasonic reflection data
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Contact maps obtained in ultrasonic tests for a 10 kN load
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Diameters of the contact circle extracted from ultrasonic data (60 mm diameter sphere, 10 kN load)
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Evolution of contact area features as obtained from the ultrasonic raw data: it is clearly visible that starting from a load of 6 kN the reflection (thus contact pressure) remains constant while only the diameter tends to increase (40 mm diameter sphere).
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Effect of the deconvolution procedure on the contact diameter value: the decrease observed is about 10 percent (60 mm diameter sphere, 10 kN load).
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Stains obtained from the Fuji HS Prescale film for the 100 mm sphere
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Example of a diametrical section of a contact circle as obtained from the Fuji film: the dotted line denotes the gray threshold chosen for calculation (100 mm diameter sphere, 10 kN load).
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Variation in the diameter of the contact circle with the applied load: comparison between the ultrasonic and Fuji film results for all tested spheres.



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