Direct observation of frictional contacts: New insights for state-dependent properties

Dieterich, James H.; Kilgore, Brian D.

doi:10.1007/bf00874332

Cited by 833 publications

(786 citation statements)

References 22 publications

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“…We presume that l is independent of the pressure based on a previous established experimental observation [Dieterich and Kilgore, 1994]. Thus, V w is independent of the pressure.…”

Section: Analysis Of the Intermediate-velocity Regimementioning

confidence: 99%

Flash weakening is limited by granular dynamics

Kuwano

Hatano

2011

Geophys. Res. Lett.

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[1] We measured the steady-state friction coefficient of granite over a wide range of sliding velocities and pressures. We observed considerable weakening, described well by a flash-heating theory, above the sliding velocity of 1 cm/s regardless of pressure. At higher velocities, the velocity strengthening behavior replaced the velocity weakening behavior. This strengthening at higher velocities agrees with data from numerical simulations on sheared granular matter and is therefore described in terms of energy dissipation due to the inelastic deformation of grains. We propose a unified steady-state friction law that well describes the velocity and pressure dependence of the steady-state friction coefficient. Citation: Kuwano, O., and T. Hatano (2011), Flash weakening is limited by granular dynamics, Geophys. Res. Lett., 38, L17305,

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“…We presume that l is independent of the pressure based on a previous established experimental observation [Dieterich and Kilgore, 1994]. Thus, V w is independent of the pressure.…”

Section: Analysis Of the Intermediate-velocity Regimementioning

confidence: 99%

Flash weakening is limited by granular dynamics

Kuwano

Hatano

2011

Geophys. Res. Lett.

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“…In this paper we assume (1) and (2) represent the shear resistance of a population of contacts between particles or asperities in the fault zone, consistent with the original usage of Dieterich [1979]. Accordingly, the direct effect represents the strain rate sensitivity of points of contact on the fault surface, and the evolution effect represents the sensitivity of friction to the change in area of contacts in the fault zone [Dieterich, 1979;Dieterich and Conrad, 1984;Dieterich and Kilgore, 1994]. …”

Section: Constitutive Equationsmentioning

confidence: 99%

The roles of time and displacement in velocity‐dependent volumetric strain of fault zones

Beeler¹,

Tullis²

1997

J. Geophys. Res.

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“…Real contact areas at asperities increase more rapidly during holds in friction tests than one would infer by measuring friction after sliding resumes or after changes in sliding velocity [Dieterich and Kilgore, 1994;Goldsby et al, 2004]. The first increment of shear strain before friction peaks at the restart of sliding after the holds destroys some of the real area of contact, weakening the gouge without changing porosity.…”

Section: Discussionmentioning

confidence: 98%

“…Results from many laboratory friction experiments suggest that the state variable can be related to the effective contact area of asperities in the active shear band [e.g., Dieterich and Kilgore, 1994] or to the energy available to dilate the gouge layer [Beeler and Tullis, 1997].…”

Section: Porosity and The State Variablementioning

confidence: 99%

Application of rate‐and‐state friction laws to creep compaction of unconsolidated sand under hydrostatic loading conditions

2007

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[1] Rate-and-state variable friction laws describe the time-dependent fault-normal compaction that occurs during holds in slide-hold-slide friction tests on unconsolidated materials. This time-dependent deformation is qualitatively similar to that observed during volumetric creep strain tests on unconsolidated sands and shales under hydrostatic loading conditions. To test whether rate-and-state friction laws can be used to model volumetric creep processes in unconsolidated sands, the rate-and-state formulation is expanded to include deformation under hydrostatic stress boundary conditions. Results show that the hydrostatic stress form of the rate-and-state friction law successfully describes the creep strain of unconsolidated sand. More importantly, values obtained for rate-and-state friction parameters by fitting these data are in the same range as those obtained from more traditional tests by fitting the fault-normal compaction of simulated gouge during a hold in a laboratory friction experiment.

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Direct observation of frictional contacts: New insights for state-dependent properties

Cited by 833 publications

References 22 publications

Flash weakening is limited by granular dynamics

Flash weakening is limited by granular dynamics

The roles of time and displacement in velocity‐dependent volumetric strain of fault zones

Application of rate‐and‐state friction laws to creep compaction of unconsolidated sand under hydrostatic loading conditions

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