Modeling Dense Granular Flow : A Nonequilibrium Thermodynamics Approach and Implications of Grain Fragmentation, Acoustic Effects and Interparticle Friction on Dynamic Friction
- Degree Grantor:
- University of California, Santa Barbara. Physics
- Degree Supervisor:
- Jean M. Carlson
- Place of Publication:
- [Santa Barbara, Calif.]
- Publisher:
- University of California, Santa Barbara
- Creation Date:
- 2015
- Issued Date:
- 2015
- Topics:
- Materials science and Geophysics
- Keywords:
- Granular materials,
Friction,
Stick-slip,
Nonequilibrium thermodynamics,
Shear transformation zones, and
Granular flow - Genres:
- Online resources and Dissertations, Academic
- Dissertation:
- Ph.D.--University of California, Santa Barbara, 2015
- Description:
Granular flow rheology has broad implications on earth science and industrial processing of raw materials. This dissertation is an overview of our effort to understand dense granular flow and the influence of microscopic, grain-scale processes on dynamic friction from basic principles of nonequilibrium thermodynamics. First, I will provide a short introduction to the Shear-Transformation-Zone (STZ) theory of plastic deformation and the underlying theoretical framework of nonequilibrium thermodynamics, and use the Haxton-Liu hard-sphere simulations as a testing ground for the theory. Next, I will briefly discuss grain fragmentation and examine its implication on shear weakening and shear localization; in so doing, we account for the formation and persistence of shear bands of fragmented particles. Finally, I propose a way to incorporate acoustic effects, particle angularity, and interparticle friction into the STZ model. We show good agreement with laboratory experiments on angular sand particles that indicate shear-induced acoustic compaction at intermediate strain rates. We show in addition that friction between particles is essential in producing stick-slip instabilities, which can be controlled by the confining pressure and external vibrations.
- Physical Description:
- 1 online resource (162 pages)
- Format:
- Text
- Collection(s):
- UCSB electronic theses and dissertations
- Other Versions:
- http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3733517
- ARK:
- ark:/48907/f3zs2tp2
- ISBN:
- 9781339218106
- Catalog System Number:
- 990045865680203776
- Copyright:
- Charles Lieou, 2015
- Rights:
- In Copyright
- Copyright Holder:
- Charles Lieou
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