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Phys Rev E Stat Nonlin Soft Matter Phys. 2001 Jun;63(6):061604. doi: 10.1103/PhysRevE.63.061604. Epub 2001 May 24.

Interaction and deformation of viscoelastic particles: nonadhesive particles.

Physical review. E, Statistical, nonlinear, and soft matter physics

P Attard

Affiliations

  1. Ian Wark Research Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.

PMID: 11415116 DOI: 10.1103/PhysRevE.63.061604

Abstract

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.

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