Impact-Activated Solidification of Cornsta...

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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.

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.

Inhaltsverzeichnis

Introduction.- Freely Accelerating Impact into Cornstarch and Water Suspensions.- Dynamic Jamming Fronts in a Model 2D System.- Speed-Controlled Impact into Cornstarch and Water Suspensions.- Results and Conclusions.- A: Penetration Regime in Freely Accelerating Impact.- B: Details of X-Ray Experiments.- C: Detailed Discussion of Added Mass.- D: "Viscous" Model for Impact.- E: Cornstarch Particle Modulus.- F: 1D Model of Particles Immersed in a Viscous Liquid.

Details

Erscheinungsjahr:	2016
Fachbereich:	Astronomie
Genre:	Physik
Rubrik:	Naturwissenschaften & Technik
Medium:	Taschenbuch
Inhalt:	xviii 88 S. 33 s/w Illustr. 20 farbige Illustr. 88 p. 53 illus. 20 illus. in color.
ISBN-13:	9783319359274
ISBN-10:	3319359274
Sprache:	Englisch
Herstellernummer:	978-3-319-35927-4
Einband:	Kartoniert / Broschiert
Autor:	Waitukaitis, Scott R.
Auflage:	Softcover reprint of the original 1st ed. 2015
Hersteller:	Springer Springer, Berlin
Verantwortliche Person für die EU:	Springer Verlag GmbH, Tiergartenstr. 17, D-69121 Heidelberg, juergen.hartmann@springer.com
Abbildungen:	XVIII, 88 p. 53 illus., 20 illus. in color.
Maße:	6 x 155 x 235 mm
Von/Mit:	Scott R. Waitukaitis
Erscheinungsdatum:	17.09.2016
Gewicht:	0,178 kg

Artikel-ID: 111861653