Research Articles

Rapid Contact on a Prestressed Highly Elastic Half-Space: The Sliding Ellipsoid and Rolling Sphere

[+] Author and Article Information
L. M. Brock

Fellow ASME
Mechanical Engineering,
University of Kentucky,
Lexington, KY 40506
e-mail: brock@engr.uky.edu

Manuscript received June 12, 2012; final manuscript received August 20, 2012; accepted manuscript posted August 27, 2012; published online January 28, 2013. Assoc. Editor: Pradeep Sharma.

J. Appl. Mech 80(2), 021023 (Jan 28, 2013) (8 pages) Paper No: JAM-12-1225; doi: 10.1115/1.4007478 History: Received June 12, 2012; Revised August 20, 2012; Accepted August 27, 2012

A neo-Hookean half-space, in equilibrium under uniform Cauchy stress, undergoes contact by a sliding rigid ellipsoid or a rolling rigid sphere. Sliding is resisted by friction, and sliding or rolling speed is subcritical. It is assumed that a dynamic steady state is achieved and that deformation induced by contact is infinitesimal. Transform methods, modified by introduction of quasi-polar coordinates, are used to obtain classical singular integral equations for this deformation. Assumptions of specific contact zone shape are not required. Signorini conditions and the requirement that resultant compressive load is stationary with respect to contact zone stress give an equation for any contact zone span in terms of a reference value and an algebraic formula for the latter. Calculations show that prestress can significantly alter the ratio of spans parallel and normal to the direction of die travel, an effect enhanced by increasing die speed.

Copyright © 2013 by ASME
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