CUED Publications database

Elastic contact with a `donut'-shaped asperity

Greenwood, JA (2001) Elastic contact with a `donut'-shaped asperity. International Journal of Mechanical Sciences, 43. pp. 1473-1482. ISSN 0020-7403

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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 analyze 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)].

Item Type: Article
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 19 Jun 2020 21:21
Last Modified: 25 Jun 2020 11:02
DOI: 10.1016/S0020-7403(00)00071-0