Impact-Activated Solidification of Cornstarch and Water Suspensions

Nonfiction, Science & Nature, Science, Physics, Spectrum Analysis, Mechanics
Cover of the book Impact-Activated Solidification of Cornstarch and Water Suspensions by Scott R. Waitukaitis, Springer International Publishing
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Author: Scott R. Waitukaitis ISBN: 9783319091839
Publisher: Springer International Publishing Publication: July 28, 2014
Imprint: Springer Language: English
Author: Scott R. Waitukaitis
ISBN: 9783319091839
Publisher: Springer International Publishing
Publication: July 28, 2014
Imprint: Springer
Language: English

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.

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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.

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