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Impact-Activated Solidification of Cornstarch and Water Suspensions

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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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Series Title

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Call Number

664 WAI i

Publisher

: ., 2015

Collation

XVIII, 88

Language

English

ISBN/ISSN

978-3-319-09182-2

Classification

664

Content Type

text

Media Type

computer

Carrier Type

online resource

Edition

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Subject(s)

Soft and Granular Matter

Specific Detail Info

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Statement of Responsibility

Scott R. Waitukaitis

Other Information

Cataloger

Khusnun

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