impacts97 abstract
Imperfectly Constrained Planar Impacts ---
A Coefficient-of-Restitution Model
G.G. Adams
Summary
A simple coeffiecient-of-restitution model is proposed for the impact of a
rigid body, constrained by an imperfect pin support, with a rigid
barrier. The collision process is represented by two phases. In the first
stage the rigid body impacts the barrier with negligible influence from the
support. The next phase is characterized by an impact between the rigid body and the imperfect pin support. This second phase commences when impact with
the barrier has ceased. Both moving and stationary barriers are considered.
In the case of a moving barrier, energy can be added to the rigid body due to
the work done by the friction force exerted by the moving barrier. Such a
result is not predicted with the usual constrained impact formulation. Impact
with a stationary barrier is characterized by continuous slip, slip reversal,
or slip followed by stick. A {\em constrained} coefficient of restitution is
presented for these partially constrained impacts.
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