Leseprobe
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Impact-Activated Solidification of Cornstarch and Water Suspensions
Scott R. Waitukaitis
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Springer International Publishing 
Naturwissenschaften, Medizin, Informatik, Technik / Atomphysik, Kernphysik
Beschreibung
This thesis approaches impact resistance in dense suspensions from a new perspective. The most well-known example of dense suspensions, a mixture of cornstarch and water, provides enough impact resistance to allow a person to run across its surface. In the past, this phenomenon had been linked to "shear thickening" under a steady shear state attributed to hydrodynamic interactions or granular dilation. However, neither explanation accounted for the stress scales required for a person to run on the surface.
Through this research, it was discovered that the impact resistance is due to local compression of the particle matrix. This compression forces the suspension across the jamming transition and precipitates a rapidly growing solid mass. This growing solid, as a result, absorbs the impact energy. This is the first observation of such jamming front, linking nonlinear suspension dynamics in a new way to the jamming phase transition known from dry granular materials.
Kundenbewertungen
Impact-driven Solidification, Dynamic Jamming Fronts, Nonlinear Suspension Dynamics, Cornstarch and Water Suspension Mix, Shear Thickening Suspensions, Solidification of Cornstarch and Water, Impact Response of Dense Suspensions, fluid- and aerodynamics, New Research in Dense Suspensions, Award-winning PhD Thesis, Dense Suspensions