Granular friction in a wide range of shear rates

Kuwano, Osamu; Ando, Ryosuke; Hatano, Takahiro

doi:10.1063/1.4811863

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…In principle, the linear velocity profile is expected in a simple shear geometry and thus the nonlinear velocity profile obtained here may be unexpected. Nevertheless, similar nonlinear velocity profiles are observed in a wide class of particulate systems under the simple shear [21][22][23][24][25]. In this sense, the nonlinear velocity profile in the simple shear is not very surprising.…”

Section: (C) Cause Of the Nonlinear Velocity Profilesupporting

confidence: 65%

Geological implication of grain-size segregation in dense granular matter

Itoh¹,

Hatano

2018

Phil. Trans. R. Soc. A.

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To the current common belief, grain size segregation in granular matter requires sufficient porosity. Therefore, grain size segregation found in a natural fault gouge could imply elevated fluid pressure and the reduced normal stress on fault, possibly caused by the frictional heat during an earthquake. To clarify whether fluidization is essential to grain size segregation, we conduct numerical simulation on a simple model of fault gouge in a plane shear geometry under constant volume condition: the volume fraction is fixed at 0.6, at which the granular system possesses yield stress. We observe apparent grain size segregation at this volume fraction, meaning that grain size segregation alone does not imply fluidization of granular matter. We also show that segregation is driven by the nonlinear velocity profile, and that the gravity is not essential to segregation. The physical condition tested here may be relevant to earthquake faults: the normal stress of 1 MPa, the sliding velocity of 1 m s−1, and the duration of 0.1 s.This article is part of the theme issue ‘Statistical physics of fracture and earthquakes’.

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Section: (C) Cause Of the Nonlinear Velocity Profilesupporting

confidence: 65%

Geological implication of grain-size segregation in dense granular matter

Itoh¹,

Hatano

2018

Phil. Trans. R. Soc. A.

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“…However, it is worthwhile to note that many engineering devices work under the quasi-statically monotonic shear and periodically cyclic shear condition (Liu et al, 2014), such as high building and vehicle suspension system. In general, the loadings that are exerted on MR devices are divided into three kinds-static loading, dynamic loading, and quasi-static loading-which are distinguished by shear rate (Kuwano et al, 2013;Perez et al, 2016;Wang et al, 2019). The shear rate of quasi-static loading ranges from 10 −4 to 10 −1 s −1 , which works as a "bridge" between static loading and dynamic loading.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Induced Normal Stress of Magnetorheological Gel Under Quasi-Statically Monotonic and Periodically Cyclic Loading

Mao

Wang

et al. 2021

Front. Mater.

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Magnetorheological (MR) gel, an analog of MR fluid, is a novel kind of magnetic-responsive material. In this article, the influence of quasi-statically monotonic loading and periodically cyclic loading on the normal stress behavior of MR gel (MRG) is systemically investigated. Firstly, carbonyl iron powder (CIP) and soft polymer were adopted for the fabrication of MRG. Then, the variations of normal stress with shear strain were tested under different excited magnetic fields, shear rates, CIP contents, and shear strain amplitudes. It was found that the normal stress behavior of MRG exhibits three prominent stages: a sudden rise at the beginning, followed by a rapid decrease, and then a final steady-state value. The experiments also indicated that the excited magnetic field, compared with other influencing factors, has the most critical effect on the normal stress behavior of MRG. The corresponding mechanisms of various phenomena were methodically discussed. Furthermore, the ratio of shear stress to normal stress was proposed to better comprehend the mechanism of the evolution of internal microstructures of MRG and MR effects from a novel perspective. The results implied that the ratio has a close relation to the excited magnetic field and CIP content of MRG. The increase of normal stress is helpful for the fabrication of MRG with a high-efficiency MR effect.

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“…As known, the exterior loading applied to MR materials are basically categorized into three kinds: static loading, dynamic loading and quasi-static loading. [23][24][25] However, the current experiments on the rheological properties of MRG are almost conducted under the static and dynamic shear. To the best of our knowledge, the investigation on the rheological properties of MRG under quasistatic shear has never been reported.…”

Section: Introductionmentioning

confidence: 99%