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RESEARCH PAPERS

Dynamic Instabilities in the Sliding of Two Layered Elastic Half-Spaces

[+] Author and Article Information
G. G. Adams

Department of Mechanical Engineering, Northeastern University, Boston, MA 02115

J. Tribol 120(2), 289-295 (Apr 01, 1998) (7 pages) doi:10.1115/1.2834424 History: Received November 19, 1996; Revised April 28, 1997; Online January 24, 2008

Abstract

Two flat layered elastic half-spaces, of different material properties, are pressed together and slide against each other with a constant coefficient of friction. Although a nominally steady-state solution exists, an analysis of the dynamic motion yields complex eigenvalues with positive real parts, i.e., a flutter instability. These results demonstrate that self-excited (unstable) motion occurs for a wide range of material combinations. The physical mechanism responsible for this instability is that of slip-wave destabilization. The influence of the properties of the layers on the destabilization of sliding motion is investigated. These dynamic instabilities lead either to regions of stick-slip or to areas of loss-of-contact. Finally the dynamic stresses at the interfaces between the layers and the semi-infinite bodies are determined and compared to the nominally steady-state stresses. These dynamic stresses are expected to play an important role in delamination.

Copyright © 1998 by The American Society of Mechanical Engineers
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