Ian Wark Research Institute,
University of South Australia, Mawson Lakes SA 5095 Australia.
Phys. Rev. E 63, 061604 (2001).
Abstract
A viscoelastic theory is formulated
for the deformation of particles
that interact with finite-ranged surface forces.
The theory generalises the static approach
based upon classic continuum elasticity theory
to account for time-dependent effects,
and goes beyond contact theories such as Hertz and JKR
by including realistic surface interactions.
Common devices used to measure load and deformation are modelled
and the theory takes into account the driving velocity
of the apparatus and the relaxation time of the material.
Non-adhesive particles are modelled
by an electric double layer repulsion.
Triangular, step, and sinusoidal trajectories are analysed
in a unified treatment of loading and unloading.
The load-deformation and the load-contact area curves are
shown to be velocity-dependent and hysteretic.
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