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Nominated by the University of Chicago, USA, as an outstanding Ph.D. thesis
Provides evidence that the impact response of dense suspensions is caused by dynamic jamming fronts
Presents a new perspective on impact-driven solidification in dense suspensions through a mixture of cornstarch and water
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.
Content Level »Research
Keywords »Award-winning PhD Thesis - Cornstarch and Water Suspension Mix - Dense Suspensions - Dynamic Jamming Fronts - Impact Response of Dense Suspensions - Impact-driven Solidification - New Research in Dense Suspensions - Nonlinear Suspension Dynamics - Shear Thickening Suspensions - Solidification of Cornstarch and Water