Statistics of Bubble Rearrangements in a Slowly Sheared Two-dimensional Foam

Details Statistics of Bubble Rearrangements in a Slowly Sheared Two-dimensional Foam Statistics of Bubble Rearrangements in a Slowly Sheared Two-dimensional Foam

2004-05-20

arxiv.org/abs/cond-mat/0405489v1

Phys. Rev. E 70, 041406 (2004)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.70.041406

Many physical systems exhibit plastic flow when subjected to slow steady shear. A unified picture of plastic flow is still lacking; however, there is an emerging theoretical understanding of such flows based on irreversible motions of the constituent ``particles'' of the material. Depending on the specific system, various irreversible events have been studied, such as T1 events in foam and shear transformation zones (STZ's) in amorphous solids. This paper presents an experimental study of the T1 events in a model, two-dimensional foam: bubble rafts. In particular, I report on the connection between the distribution of T1 events and the behavior of the average stress and average velocity profiles during both the initial elastic response of the bubble raft and the subsequent plastic flow at sufficiently high strains.

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