Direct evidence of plastic events and dynamic heterogeneities in soft-glasses

R. Benzi, M. Sbragaglia, P. Perlekar, M. Bernaschi, S. Succi, F. Toschi

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Abstract

By using fluid-kinetic simulations of confined and concentrated emulsion droplets, we investigate the nature of space non-homogeneity in soft-glassy dynamics and provide quantitative measurements of the statistical features of plastic events in the proximity of the yield-stress threshold. Above the yield stress, our results show the existence of a finite stress correlation scale, which can be mapped directly onto the cooperativity scale, recently introduced in the literature to capture non-local effects in the soft-glassy dynamics. In this regime, the emergence of a separate boundary (wall) rheology with higher fluidity than the bulk, is highlighted in terms of near-wall spontaneous segregation of plastic events. Near the yield stress, where the cooperative scale cannot be estimated with sufficient accuracy, the system shows a clear increase of the stress correlation scale, whereas plastic events exhibit intermittent clustering in time, with no preferential spatial location. A quantitative measurement of the space-time correlation associated with the motion of the interface of the droplets is key to spot the long-range amorphous order at the yield stress threshold.
Original languageEnglish
Publishers.n.
Publication statusPublished - 2014

Publication series

NamearXiv
Volume1402.4441 [cond-mat.soft]

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    Benzi, R., Sbragaglia, M., Perlekar, P., Bernaschi, M., Succi, S., & Toschi, F. (2014). Direct evidence of plastic events and dynamic heterogeneities in soft-glasses. (arXiv; Vol. 1402.4441 [cond-mat.soft]). s.n.