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Emmanuel M Detournay - One of the best experts on this subject based on the ideXlab platform.

  • Normal Wedge Indentation in Rocks with Lateral Confinement
    Rock Mechanics and Rock Engineering, 1998
    Co-Authors: Haiying Huang, Branko Damjanac, Emmanuel M Detournay
    Abstract:

    The paper reports results of a numerical analysis of the wedge indentation problem. The main objective of this research is to investigate the influence of the lateral confining Stress \(\) on the development of the plastic zone under the indenter and on the initiation of Tensile fractures. Numerical analysis indicates that the location of Maximum Tensile Stress (interpreted as the point of crack initiation) moves away from the indentation axis as the lateral confinement increases. It is found that a small increase in the confining Stress from zero induces a large increase in the inclination of this point on the indentation axis. However, the confinement does not reduce significantly the Maximum Tensile Stress and it hardly influences the indentation pressure. These numerical results shed some light on the mechanism of formation of lateral or sub-horizontal Tensile cracks observed in the indentation experiments.

  • Numerical modeling of normal wedge indentation in rocks with lateral confinement
    International Journal of Rock Mechanics and Mining Sciences, 1997
    Co-Authors: Haiying Huang, Branko Damjanac, Emmanuel M Detournay
    Abstract:

    Abstract The paper reports results of a numerical analysis of the wedge indentation problem. The main objective of this research is to investigate the influence of the lateral confining Stress σ0 on the development of the plastic zone under the indenter and on the initiation of Tensile fractures. Numerical analysis indicates that the location of Maximum Tensile Stress (interpreted as the point of crack initiation) moves away from the indentation axis as the lateral confinement increases. It is found that a small increase in the confining Stress from zero induces a large increase in the inclination of this point on the indentation axis. However, the confinement does not reduce significantly the Maximum Tensile Stress and it hardly influences the indentation pressure. These numerical results shed some lights on the mechanism of formation of lateral or sub-horizontal Tensile cracks observed in the indentation experiments.

Haiying Huang - One of the best experts on this subject based on the ideXlab platform.

  • Normal Wedge Indentation in Rocks with Lateral Confinement
    Rock Mechanics and Rock Engineering, 1998
    Co-Authors: Haiying Huang, Branko Damjanac, Emmanuel M Detournay
    Abstract:

    The paper reports results of a numerical analysis of the wedge indentation problem. The main objective of this research is to investigate the influence of the lateral confining Stress \(\) on the development of the plastic zone under the indenter and on the initiation of Tensile fractures. Numerical analysis indicates that the location of Maximum Tensile Stress (interpreted as the point of crack initiation) moves away from the indentation axis as the lateral confinement increases. It is found that a small increase in the confining Stress from zero induces a large increase in the inclination of this point on the indentation axis. However, the confinement does not reduce significantly the Maximum Tensile Stress and it hardly influences the indentation pressure. These numerical results shed some light on the mechanism of formation of lateral or sub-horizontal Tensile cracks observed in the indentation experiments.

  • Numerical modeling of normal wedge indentation in rocks with lateral confinement
    International Journal of Rock Mechanics and Mining Sciences, 1997
    Co-Authors: Haiying Huang, Branko Damjanac, Emmanuel M Detournay
    Abstract:

    Abstract The paper reports results of a numerical analysis of the wedge indentation problem. The main objective of this research is to investigate the influence of the lateral confining Stress σ0 on the development of the plastic zone under the indenter and on the initiation of Tensile fractures. Numerical analysis indicates that the location of Maximum Tensile Stress (interpreted as the point of crack initiation) moves away from the indentation axis as the lateral confinement increases. It is found that a small increase in the confining Stress from zero induces a large increase in the inclination of this point on the indentation axis. However, the confinement does not reduce significantly the Maximum Tensile Stress and it hardly influences the indentation pressure. These numerical results shed some lights on the mechanism of formation of lateral or sub-horizontal Tensile cracks observed in the indentation experiments.

K Hayashi - One of the best experts on this subject based on the ideXlab platform.

  • The Maximum Tensile stres on a hard coating under sliding friction
    Tribology International, 1994
    Co-Authors: Dongfeng Diao, Koji Kato, K Hayashi
    Abstract:

    Abstract In the friction of a hard coating the Maximum Tensile Stress in the sliding direction generated at the friction surface is important for predicting crack propagation in the coating. The finite element method is employed to evaluate the Stress field in the hard coating and the substrate under frictional loads, and the ratio between the values of Maximum Tensile Stress and the Maximum contact pressure is calculated under various contact conditions. Finally, a simple equation is introduced for the calculation of the Maximum Tensile Stress at the friction surface. This equation is a function of friction coefficient, Maximum contact pressure, coating thickness, contact width and elastic moduli of coating and substrate, and gives the value of the Maximum Tensile Stress which is affected by the existence of the substrate.

Branko Damjanac - One of the best experts on this subject based on the ideXlab platform.

  • Normal Wedge Indentation in Rocks with Lateral Confinement
    Rock Mechanics and Rock Engineering, 1998
    Co-Authors: Haiying Huang, Branko Damjanac, Emmanuel M Detournay
    Abstract:

    The paper reports results of a numerical analysis of the wedge indentation problem. The main objective of this research is to investigate the influence of the lateral confining Stress \(\) on the development of the plastic zone under the indenter and on the initiation of Tensile fractures. Numerical analysis indicates that the location of Maximum Tensile Stress (interpreted as the point of crack initiation) moves away from the indentation axis as the lateral confinement increases. It is found that a small increase in the confining Stress from zero induces a large increase in the inclination of this point on the indentation axis. However, the confinement does not reduce significantly the Maximum Tensile Stress and it hardly influences the indentation pressure. These numerical results shed some light on the mechanism of formation of lateral or sub-horizontal Tensile cracks observed in the indentation experiments.

  • Numerical modeling of normal wedge indentation in rocks with lateral confinement
    International Journal of Rock Mechanics and Mining Sciences, 1997
    Co-Authors: Haiying Huang, Branko Damjanac, Emmanuel M Detournay
    Abstract:

    Abstract The paper reports results of a numerical analysis of the wedge indentation problem. The main objective of this research is to investigate the influence of the lateral confining Stress σ0 on the development of the plastic zone under the indenter and on the initiation of Tensile fractures. Numerical analysis indicates that the location of Maximum Tensile Stress (interpreted as the point of crack initiation) moves away from the indentation axis as the lateral confinement increases. It is found that a small increase in the confining Stress from zero induces a large increase in the inclination of this point on the indentation axis. However, the confinement does not reduce significantly the Maximum Tensile Stress and it hardly influences the indentation pressure. These numerical results shed some lights on the mechanism of formation of lateral or sub-horizontal Tensile cracks observed in the indentation experiments.

Dongfeng Diao - One of the best experts on this subject based on the ideXlab platform.

  • The Maximum Tensile stres on a hard coating under sliding friction
    Tribology International, 1994
    Co-Authors: Dongfeng Diao, Koji Kato, K Hayashi
    Abstract:

    Abstract In the friction of a hard coating the Maximum Tensile Stress in the sliding direction generated at the friction surface is important for predicting crack propagation in the coating. The finite element method is employed to evaluate the Stress field in the hard coating and the substrate under frictional loads, and the ratio between the values of Maximum Tensile Stress and the Maximum contact pressure is calculated under various contact conditions. Finally, a simple equation is introduced for the calculation of the Maximum Tensile Stress at the friction surface. This equation is a function of friction coefficient, Maximum contact pressure, coating thickness, contact width and elastic moduli of coating and substrate, and gives the value of the Maximum Tensile Stress which is affected by the existence of the substrate.