Elastic contact with a “donut”-shaped asperity |
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Authors: | J A Greenwood |
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Affiliation: | Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK |
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Abstract: | The laser-textured surfaces used for the touchdown area of computer hard-disks are sometimes covered with asperities consisting of a crater surrounded by a raised rim; contact with the read-head takes place over the rim of the crater, colloquially referred to as a “donut”. In order to analyse the load/compliance relation or the stiction to be expected in contact of hard disks, a number of authors have proposed load/compliance relations for contact between such a single doughnut and a plane, usually as simple modifications of the Hertz line contact equations. In this note simple, asymptotically correct, relations for a ring asperity are derived and verified by direct solutions. In particular, the relation between elastic deflection and load is approximately δ=(W/π2RE*)ln(16R/b)+0.5)]. |
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Keywords: | Elastic contact Laser-textured surface Ring asperity Ring contact Donut-shaped asperity Load/compliance relation |
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