Abstract.
The transition from solid-like to liquid-like behavior of suspensions of monodisperse spherical particles in a Newtonian continuous phase with varying solid volume concentrations and particle sizes was investigated in rotational shear flows. It was found that the solid-liquid transition takes place in a relatively narrow shear stress range, where the corresponding shear strain γ and the shear rate \( \dot \gamma \) , respectively, increase over some orders of magnitudes. Below the transition region the material behaves like a nonlinear elastic solid with an initial linear range, i.e., \( \gamma = f\left( \sigma \right) \) . The transition depends on the type of the shear loading and on the solid volume concentration. At high shear rates a nonlinear viscous behavior (\( \dot \gamma = f\left( \sigma \right) \) ) with a terminal Newtonian range \( \dot \gamma = {\sigma \mathord{\left/ {\vphantom {\sigma \eta }} \right. \kern-\nulldelimiterspace} \eta } \) was observed, if the solid volume concentration is below a critical value. Above this value the material behaves like a moist bulk solid material.
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Heymann, L., Peukert, S. & Aksel, N. On the solid-liquid transition of concentrated suspensions in transient shear flow. Rheol Acta 41, 307–315 (2002). https://doi.org/10.1007/s00397-002-0227-1
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DOI: https://doi.org/10.1007/s00397-002-0227-1