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Force chains, friction, and flow: Be...

Hurley, Ryan C.

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Force chains, friction, and flow: Behavior of granular media across length scales.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Force chains, friction, and flow: Behavior of granular media across length scales./
作者:	Hurley, Ryan C.
面頁冊數:	155 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-03(E), Section: B.
Contained By:	Dissertation Abstracts International77-03B(E).
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3731185
ISBN:	9781339175515

Force chains, friction, and flow: Behavior of granular media across length scales.
Hurley, Ryan C.

Force chains, friction, and flow: Behavior of granular media across length scales. - 155 p.

Source: Dissertation Abstracts International, Volume: 77-03(E), Section: B.

Thesis (Ph.D.)--California Institute of Technology, 2016.

We study the behavior of granular materials at three length scales. At the smallest length scale, the grain-scale, we study inter-particle forces and "force chains''. Inter-particle forces are the natural building blocks of constitutive laws for granular materials. Force chains are a key signature of the heterogeneity of granular systems. Despite their fundamental importance for calibrating grain-scale numerical models and elucidating constitutive laws, inter-particle forces have not been fully quantified in natural granular materials. We present a numerical force inference technique for determining inter-particle forces from experimental data and apply the technique to two-dimensional and three-dimensional systems under quasi-static and dynamic load. These experiments validate the technique and provide insight into the quasi-static and dynamic behavior of granular materials.

ISBN: 9781339175515Subjects--Topical Terms:

649730
Mechanical engineering.

Force chains, friction, and flow: Behavior of granular media across length scales.
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245 1 0 $a Force chains, friction, and flow: Behavior of granular media across length scales.
300 $a 155 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-03(E), Section: B.
500 $a Adviser: Jose E. Andrade.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2016.
520 $a We study the behavior of granular materials at three length scales. At the smallest length scale, the grain-scale, we study inter-particle forces and "force chains''. Inter-particle forces are the natural building blocks of constitutive laws for granular materials. Force chains are a key signature of the heterogeneity of granular systems. Despite their fundamental importance for calibrating grain-scale numerical models and elucidating constitutive laws, inter-particle forces have not been fully quantified in natural granular materials. We present a numerical force inference technique for determining inter-particle forces from experimental data and apply the technique to two-dimensional and three-dimensional systems under quasi-static and dynamic load. These experiments validate the technique and provide insight into the quasi-static and dynamic behavior of granular materials.
520 $a At a larger length scale, the mesoscale, we study the emergent frictional behavior of a collection of grains. Properties of granular materials at this intermediate scale are crucial inputs for macro-scale continuum models. We derive friction laws for granular materials at the mesoscale by applying averaging techniques to grain-scale quantities. These laws portray the nature of steady-state frictional strength as a competition between steady-state dilation and grain-scale dissipation rates. The laws also directly link the rate of dilation to the non-steady-state frictional strength.
520 $a At the macro-scale, we investigate continuum modeling techniques capable of simulating the distinct solid-like, liquid-like, and gas-like behaviors exhibited by granular materials in a single computational domain. We propose a Smoothed Particle Hydrodynamics (SPH) approach for granular materials with a viscoplastic constitutive law. The constitutive law uses a rate-dependent and dilation-dependent friction law. We provide a theoretical basis for a dilation-dependent friction law using similar analysis to that performed at the mesoscale. We provide several qualitative and quantitative validations of the technique and discuss ongoing work aiming to couple the granular flow with gas and fluid flows.
590 $a School code: 0037.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Soil sciences. $3 2122699
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710 2 $a California Institute of Technology. $b Applied Mechanics. $3 2101741
773 0 $t Dissertation Abstracts International $g 77-03B(E).
790 $a 0037
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3731185