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Journal Articles Journal of Rheology Year : 2013

Compressive consolidation of strongly aggregated particle gels

Abstract

The compressive yield stress of particle gels shows a highly nonlinear dependence on the packing fraction. We have studied continuous compression processes and discussed the packing-fraction dependence with the particle-scale rearrangements. The two-dimensional simulation of uniaxial compression was applied to fractal networks, and the required compressive stresses were evaluated for a wide range of packing fractions that approached close packing. The compression acts to reduce the size of the characteristic structural entities (i.e., the correlation length of the structure). We observed three stages of compression: (I) Elastic-dominant regime; (II) single-mode plastic regime, where the network strengths are determined by the typical length scale and the rolling mode; and (III) multimode plastic regime, where sliding mode and connection breaks are important. We also investigated the way of losing the fractal correlation under compression. It turns out that both fractal dimension Df and correlation length ξ start to change from the early stage of compression, which is different from the usual assumption in theoretical models.
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Dates and versions

hal-00877233 , version 1 (28-10-2013)

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Ryohei Seto, Robert Botet, Martine Meireles, Günter K. Auernhammer, Bernard Cabane. Compressive consolidation of strongly aggregated particle gels. Journal of Rheology, 2013, vol. 57, pp. 1347-1365. ⟨10.1122/1.4817436⟩. ⟨hal-00877233⟩
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