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- W2528974827 abstract "We investigated the transient relaxation of a Discontinuous Shear Thickening (DST) suspension of cornstarch in water. Starting from a steady shear in a parallel plate rheometer, we stopped the top plate rotation and measured the transient stress relaxation. We found that at low effective packing fraction $phi_{eff}$, the suspensions exhibited a relaxation behavior consistent with a rheometric fluid in which the relaxation is determined by the steady-state viscosity. However, for larger $phi_{eff}$, we find up to two exponential relaxation regimes, which both become distinct from the rheometric model. The discrepancy between the measured relaxation times and the rheometric prediction was found to be as large as 4 orders of magnitude and diverges in the limit as $phi_{eff} rightarrow phi_c$, corresponding to the liquid solid transition, as the measured relaxation times diverge to infinity while the rheometric prediction approaches 0. In this limit, the measured relaxation time scales are on the order of $sim 1$ s, which may be important to understanding the dynamic phenomenon exhibited by DST suspensions. We also showed that using the shear rate $dotgamma_c$ at the onset of shear thickening to characterize the effective packing fraction $phi_{eff}$ can more precisely characterize material properties near $phi_c$. This conversion to $phi_{eff}$ can also be used to compare experiments done in other laboratories or under different temperature and humidity conditions on a consistent $phi_{eff}$ scale at our reference temperature and humidity environment." @default.
- W2528974827 created "2016-10-14" @default.
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- W2528974827 date "2016-10-05" @default.
- W2528974827 modified "2023-09-27" @default.
- W2528974827 title "Anomalous divergence of a relaxation time in discontinuous shear thickening suspensions" @default.
- W2528974827 hasPublicationYear "2016" @default.
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