Nonlinear stress and fluctuation dynamics of sheared disordered wet foam

Ethan Pratt and Michael Dennin
Phys. Rev. E 67, 051402 – Published 9 May 2003
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Abstract

A sheared wet foam, which stores elastic energy in bubble deformations, relaxes stress through bubble rearrangements. The intermittency of bubble rearrangements in the foam leads to effectively stochastic drops in stress that are followed by periods of elastic increase. We investigate global characteristics of highly disordered foams over three decades of strain rate and almost two decades of system size. We characterize the behavior using a range of measures: average stress, distribution of stress drops, rate of stress drops, and a normalized fluctuation intensity. There is essentially no dependence on system size. As a function of strain rate, there is a change in behavior around shear rates of 0.07s1.

  • Received 7 January 2003

DOI:https://doi.org/10.1103/PhysRevE.67.051402

©2003 American Physical Society

Authors & Affiliations

Ethan Pratt

  • Department of Physics, California Polytechnic State University, San Luis Obispo, California 93407

Michael Dennin

  • Department of Physics and Astronomy and Institute for Interfacial and Surface Science, University of California at Irvine, Irvine, California 92697

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Vol. 67, Iss. 5 — May 2003

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