layer97 abstract
Dynamic Instabilities in the Sliding of Two Layered Elastic Half-Spaces
G.G. Adams
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.
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