Radhakrishnan, Rangarajan and Divoux, Thibaut and Manneville, Sébastien and Fielding, Suzanne M. (2017) 'Understanding rheological hysteresis in soft glassy materials.', Soft matter., 13 (9). 1834-1852 .
Motivated by recent experimental studies of rheological hysteresis in soft glassy materials, we study numerically strain rate sweeps in simple yield stress fluids and viscosity bifurcating yield stress fluids. Our simulations of downward followed by upward strain rate sweeps, performed within fluidity models and the soft glassy rheology model, successfully capture the experimentally observed monotonic decrease of the area of the rheological hysteresis loop with sweep time in simple yield stress fluids, and the bell shaped dependence of hysteresis loop area on sweep time in viscosity bifurcating fluids. We provide arguments explaining these two different functional forms in terms of differing tendencies of simple and viscosity bifurcating fluids to form shear bands during the sweeps, and show that the banding behaviour captured by our simulations indeed agrees with that reported experimentally. We also discuss the difference in hysteresis behaviour between inelastic and viscoelastic fluids. Our simulations qualitatively agree with the experimental data discussed here for four different soft glassy materials.
|Full text:||(AM) Accepted Manuscript|
Download PDF (1345Kb)
|Publisher Web site:||https://doi.org/10.1039/C6SM02581A|
|Date accepted:||30 January 2017|
|Date deposited:||10 May 2017|
|Date of first online publication:||30 January 2017|
|Date first made open access:||30 January 2018|
Save or Share this output
|Look up in GoogleScholar|