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Interaction and deformation of viscoelastic particles: Nonadhesive particles Phil Attard

Summary: Interaction and deformation of viscoelastic particles: Nonadhesive particles
Phil Attard
Ian Wark Research Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
Received 20 November 2000; published 24 May 2001
A viscoelastic theory is formulated for the deformation of particles that interact with finite-ranged surface
forces. The theory generalizes the static approach based upon classic continuum elasticity theory to account for
time-dependent effects, and goes beyond contact theories such as Hertz and that given by Johnson, Kendall,
and Roberts by including realistic surface interactions. Common devices used to measure load and deformation
are modeled and the theory takes into account the driving velocity of the apparatus and the relaxation time of
the material. Nonadhesive particles are modeled by an electric double layer repulsion. Triangular, step, and
sinusoidal trajectories are analyzed 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.
DOI: 10.1103/PhysRevE.63.061604 PACS number s : 83.60.Bc, 68.35. p, 83.50. v, 68.37.Ps
The interactions of macroscopic bodies, microscopic par-
ticles, and macromolecules are mediated by their surface
forces, and much attention has focussed upon measuring
these forces directly and upon developing quantitative theo-
ries for them. The two generic forces that are well estab-
lished, the van der Waals attraction and the electric double


Source: Attard, Phil - School of Chemistry, University of Sydney


Collections: Chemistry