Abstract
The impact-activated solidification of cornstarch suspensions has proven to be a multi-faceted problem and a complete explanation of the different phenomena observed during this process remains elusive. In this work, we revisit this rich problem and focus on impact on shallow suspension baths where the solidification partly leads to bouncing of the impactor. We systematically vary the depth and solid fraction of the suspension, the mass of the impactor, and the impact velocity to determine which conditions lead to bouncing. For cases where bouncing occurs we observe distinctly different dynamics as compared to those cases without it. Our results allow us to connect the velocity oscillations and stop-go cycles that were observed during settling in a deep layer, with more recent work dealing with high-force and high-speed impact on a cornstarch suspension.
Highlights
Suspensions of cornstarch in water have become a shearthickening model system because they present continuous shear thickening, discontinuous shear thickening and shear jamming in a clear manner [2, 16]
To map out the bouncing behavior of the suspension layer, we systematically changed the layer depth HCs and volume fraction Cs and for each case impacted it with different masses and velocities to explore under which conditions bouncing was observed
We combined the effects of cylinder mass and impact velocity by plotting the kinetic energy at impact, Ki = McylgHfall1
Summary
Suspensions of cornstarch in water have become a shearthickening model system because they present continuous shear thickening, discontinuous shear thickening and shear jamming in a clear manner [2, 16]. This article is part of the Topical Collection: In Memoriam of Robert P. Recent work from the Behringer group [9] provided evidence for the existence of two fronts, namely a fast pressure front followed by the slower, abovementioned solidification front. This was realized by replacing one of the side walls by a photo-elastic material, creating a sensitive device to measure pressure and pressure wave speeds
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