Stress–structure relation in dense colloidal melts under forward and instantaneous reversal of the shear

Bhattacharjee, Amit Kumar

Stress–structure relation in dense colloidal melts under forward and instantaneous reversal of the shear

Files

Bhattacharjee_0-311757.pdf(2.33 MB)

Date

2015

Authors

Bhattacharjee, Amit Kumar

Publication type

Journal article

Publication status

Published

Published in

Soft Matter ; 11 (2015), 28. - pp. 5697-5704. - ISSN 1744-683X. - eISSN 1744-6848

Abstract

A dense supercooled colloidal melt in forward shear from a quiescent state shows overshoot in the shear stress at 10% strain with an unchanged fluid structure at equal stress before and after overshoot. In addition, we find an overshoot in the normal stress witha monotonic increase in the osmotic pressure at an identical strain. The first and second normal stresses become comparable in magnitude and opposite in sign. A functional dependence of the steady state stress and osmotic pressure with the Péclet number demonstrates the signature of crossover between Newtonian and nearly-Newtonian regimes. Moreover, instantaneous shear reversal from a steady state exhibiting the bauschinger effect, where a strong history dependence is observed depending on the time of the flow reversal is shown to be a signature of the subsequent response. We link the history dependence of the stress-strain curves to changes in the fluid structure measured through the angular components of the radial distribution function. A uniform compression in the transition from forward to reversed flowing states is found.

Subject (DDC)

530 Physics

Cite This

ISO 690

BHATTACHARJEE, Amit Kumar, 2015. Stress–structure relation in dense colloidal melts under forward and instantaneous reversal of the shear. In: Soft Matter. 11(28), pp. 5697-5704. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/C4SM02790F

BibTex

@article{Bhattacharjee2015Stres-33013,
  year={2015},
  doi={10.1039/C4SM02790F},
  title={Stress–structure relation in dense colloidal melts under forward and instantaneous reversal of the shear},
  number={28},
  volume={11},
  issn={1744-683X},
  journal={Soft Matter},
  pages={5697--5704},
  author={Bhattacharjee, Amit Kumar}
}

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