THE MICROMECHANICS OF FRICTION IN A GRANULAR LAYER

CG SAMMIS, SJ STEACY

    Research output: Contribution to journalArticle

    46 Citations (Scopus)

    Abstract

    A grain bridge model is used to provide a physical interpretation of the rate- and state-dependent friction parameters for the simple shear of a granular layer. This model differs from the simpler asperity model in that it recognizes the difference between the fracture of a grain and the fracture of an adhesion between grains, and it explicitly accounts for dilation in the granular layer. The model provides an explanation for the observed differences in the friction of granular layers deformed between rough surfaces and those deformed between smooth surfaces and for the evolution of the friction parameters with displacement. The observed evolution from velocity strengthening to velocity weakening with displacement is interpreted as being due to the change in the micromechanics of strain accommodation from grain crushing to slip between adjacent grains; this change is associated with the observed evolution of a fractal grain structure.
    LanguageEnglish
    Pages777-794
    JournalPure and Applied Geophysics
    Volume142
    Issue number3-4
    Publication statusPublished - 1994

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    micromechanics
    friction
    asperity
    dilation
    crushing
    adhesion
    parameter

    Cite this

    SAMMIS, CG., & STEACY, SJ. (1994). THE MICROMECHANICS OF FRICTION IN A GRANULAR LAYER. Pure and Applied Geophysics, 142(3-4), 777-794.
    SAMMIS, CG ; STEACY, SJ. / THE MICROMECHANICS OF FRICTION IN A GRANULAR LAYER. In: Pure and Applied Geophysics. 1994 ; Vol. 142, No. 3-4. pp. 777-794.
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    abstract = "A grain bridge model is used to provide a physical interpretation of the rate- and state-dependent friction parameters for the simple shear of a granular layer. This model differs from the simpler asperity model in that it recognizes the difference between the fracture of a grain and the fracture of an adhesion between grains, and it explicitly accounts for dilation in the granular layer. The model provides an explanation for the observed differences in the friction of granular layers deformed between rough surfaces and those deformed between smooth surfaces and for the evolution of the friction parameters with displacement. The observed evolution from velocity strengthening to velocity weakening with displacement is interpreted as being due to the change in the micromechanics of strain accommodation from grain crushing to slip between adjacent grains; this change is associated with the observed evolution of a fractal grain structure.",
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    note = "Meeting of the American-Geophysical-Union, SAN FRANCISCO, CA, MAY, 1993",
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    SAMMIS, CG & STEACY, SJ 1994, 'THE MICROMECHANICS OF FRICTION IN A GRANULAR LAYER', Pure and Applied Geophysics, vol. 142, no. 3-4, pp. 777-794.

    THE MICROMECHANICS OF FRICTION IN A GRANULAR LAYER. / SAMMIS, CG; STEACY, SJ.

    In: Pure and Applied Geophysics, Vol. 142, No. 3-4, 1994, p. 777-794.

    Research output: Contribution to journalArticle

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    T1 - THE MICROMECHANICS OF FRICTION IN A GRANULAR LAYER

    AU - SAMMIS, CG

    AU - STEACY, SJ

    N1 - Meeting of the American-Geophysical-Union, SAN FRANCISCO, CA, MAY, 1993

    PY - 1994

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    AB - A grain bridge model is used to provide a physical interpretation of the rate- and state-dependent friction parameters for the simple shear of a granular layer. This model differs from the simpler asperity model in that it recognizes the difference between the fracture of a grain and the fracture of an adhesion between grains, and it explicitly accounts for dilation in the granular layer. The model provides an explanation for the observed differences in the friction of granular layers deformed between rough surfaces and those deformed between smooth surfaces and for the evolution of the friction parameters with displacement. The observed evolution from velocity strengthening to velocity weakening with displacement is interpreted as being due to the change in the micromechanics of strain accommodation from grain crushing to slip between adjacent grains; this change is associated with the observed evolution of a fractal grain structure.

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