| Reynolds pressure and relaxation in a sheared granular system. | |
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MedLine Citation:
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PMID: 23383846 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We describe experiments that probe the evolution of shear jammed states, occurring for packing fractions ϕ_{S}≤ϕ≤ϕ_{J}, for frictional granular disks, where above ϕ_{J} there are no stress-free static states. We use a novel shear apparatus that avoids the formation of inhomogeneities known as shear bands. This fixed ϕ system exhibits coupling between the shear strain, γ, and the pressure, P, which we characterize by the "Reynolds pressure" and a "Reynolds coefficient," R(ϕ)=(∂^{2}P/∂γ^{2})/2. R depends only on ϕ and diverges as R∼(ϕ_{c}-ϕ)^{α}, where ϕ_{c}≃ϕ_{J} and α≃-3.3. Under cyclic shear, this system evolves logarithmically slowly towards limit cycle dynamics, which we characterize in terms of pressure relaxation at cycle n: ΔP≃-βln(n/n_{0}). β depends only on the shear cycle amplitude, suggesting an activated process where β plays a temperaturelike role. |
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Authors:
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Jie Ren; Joshua A Dijksman; Robert P Behringer |
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Publication Detail:
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Type: Journal Article Date: 2013-01-02 |
Journal Detail:
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Title: Physical review letters Volume: 110 ISSN: 1079-7114 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-02-06 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 018302 Citation Subset: IM |
Affiliation:
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Department of Physics & Center for Non-linear and Complex Systems, Duke University, Science Drive, Durham, North Carolina 27708-0305, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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