JAM Abstract
Steady Sliding of Two Elastic Half-Spaces With
Friction Reduction Due to Interface Stick-Slip
G.G. Adams
Abstract
The sliding of two perfectly flat elastic half-spaces with a constant
interfacial coefficient of friction is investigated. Previous work has
demonstrated that this configuration is dynamically unstable due to the
destabilization of frictional slip waves. It was speculated that this
dynamic instability could lead to stick-slip motion at the sliding
interface.
It is shown here that stick-slip motion at the interface can exist with
a speed-independent interface coefficient of friction. Steady motion
persists sufficiently far from the interface and thus gives the
impression of uniform sliding. This type of stick-slip motion is due
to interfacial slip waves and allows the bodies to slide with an
apparent coefficient of friction which is less than the
interface coefficient of friction. Furthermore it is shown that the
apparent friction coefficient decreases with increasing speed even if
the interface friction coefficient is speed-independent. Finally, it
is shown that the
presence of slip waves may make it possible for two frictional bodies
to slide without a resisting shear stress and without any interface
separation. No distinction is made between static and kinetic
friction.
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