The Experts below are selected from a list of 30 Experts worldwide ranked by ideXlab platform

Mohammadi Hamid - One of the best experts on this subject based on the ideXlab platform.

  • Prediction of Plastic Zone size around circular tunnels in non-hydrostatic stress field
    International Journal of Mining Science and Technology, 2014
    Co-Authors: Bagheri Behnam, Soltani Fazlollah, Mohammadi Hamid
    Abstract:

    Abstract This paper discusses the calculation of Plastic Zone properties around circular tunnels to rock-masses that satisfy the Hoek–Brown failure criterion in non-hydrostatic condition, and reviews the calculation of Plastic Zone and displacement, and the basis of the convergence–confinement method in hydrostatic condition. A two-dimensional numerical simulation model was developed to gain understanding of the Plastic Zone Shape. Plastic Zone radius in any angles around the tunnel is analyzed and measured, using different values of overburden (four states) and stress ratio (nine states). Plastic Zone radius equations were obtained from fitting curve to data which are dependent on the values of stress ratio, angle and Plastic Zone radius in hydrostatic condition. Finally validation of this equation indicate that results predict the real Plastic Zone radius appropriately.

  • Prediction of Plastic Zone size around circular tunnels in non-hydrostatic stress field
    Elsevier, 2014
    Co-Authors: Bagheri Behnam, Soltani Fazlollah, Mohammadi Hamid
    Abstract:

    This paper discusses the calculation of Plastic Zone properties around circular tunnels to rock-masses that satisfy the Hoek–Brown failure criterion in non-hydrostatic condition, and reviews the calculation of Plastic Zone and displacement, and the basis of the convergence–confinement method in hydrostatic condition. A two-dimensional numerical simulation model was developed to gain understanding of the Plastic Zone Shape. Plastic Zone radius in any angles around the tunnel is analyzed and measured, using different values of overburden (four states) and stress ratio (nine states). Plastic Zone radius equations were obtained from fitting curve to data which are dependent on the values of stress ratio, angle and Plastic Zone radius in hydrostatic condition. Finally validation of this equation indicate that results predict the real Plastic Zone radius appropriately. Keywords: Plastic Zone radius, Convergence–confinement method, Non-hydrostatic condition, Stress rati

Bagheri Behnam - One of the best experts on this subject based on the ideXlab platform.

  • Prediction of Plastic Zone size around circular tunnels in non-hydrostatic stress field
    International Journal of Mining Science and Technology, 2014
    Co-Authors: Bagheri Behnam, Soltani Fazlollah, Mohammadi Hamid
    Abstract:

    Abstract This paper discusses the calculation of Plastic Zone properties around circular tunnels to rock-masses that satisfy the Hoek–Brown failure criterion in non-hydrostatic condition, and reviews the calculation of Plastic Zone and displacement, and the basis of the convergence–confinement method in hydrostatic condition. A two-dimensional numerical simulation model was developed to gain understanding of the Plastic Zone Shape. Plastic Zone radius in any angles around the tunnel is analyzed and measured, using different values of overburden (four states) and stress ratio (nine states). Plastic Zone radius equations were obtained from fitting curve to data which are dependent on the values of stress ratio, angle and Plastic Zone radius in hydrostatic condition. Finally validation of this equation indicate that results predict the real Plastic Zone radius appropriately.

  • Prediction of Plastic Zone size around circular tunnels in non-hydrostatic stress field
    Elsevier, 2014
    Co-Authors: Bagheri Behnam, Soltani Fazlollah, Mohammadi Hamid
    Abstract:

    This paper discusses the calculation of Plastic Zone properties around circular tunnels to rock-masses that satisfy the Hoek–Brown failure criterion in non-hydrostatic condition, and reviews the calculation of Plastic Zone and displacement, and the basis of the convergence–confinement method in hydrostatic condition. A two-dimensional numerical simulation model was developed to gain understanding of the Plastic Zone Shape. Plastic Zone radius in any angles around the tunnel is analyzed and measured, using different values of overburden (four states) and stress ratio (nine states). Plastic Zone radius equations were obtained from fitting curve to data which are dependent on the values of stress ratio, angle and Plastic Zone radius in hydrostatic condition. Finally validation of this equation indicate that results predict the real Plastic Zone radius appropriately. Keywords: Plastic Zone radius, Convergence–confinement method, Non-hydrostatic condition, Stress rati

Soltani Fazlollah - One of the best experts on this subject based on the ideXlab platform.

  • Prediction of Plastic Zone size around circular tunnels in non-hydrostatic stress field
    International Journal of Mining Science and Technology, 2014
    Co-Authors: Bagheri Behnam, Soltani Fazlollah, Mohammadi Hamid
    Abstract:

    Abstract This paper discusses the calculation of Plastic Zone properties around circular tunnels to rock-masses that satisfy the Hoek–Brown failure criterion in non-hydrostatic condition, and reviews the calculation of Plastic Zone and displacement, and the basis of the convergence–confinement method in hydrostatic condition. A two-dimensional numerical simulation model was developed to gain understanding of the Plastic Zone Shape. Plastic Zone radius in any angles around the tunnel is analyzed and measured, using different values of overburden (four states) and stress ratio (nine states). Plastic Zone radius equations were obtained from fitting curve to data which are dependent on the values of stress ratio, angle and Plastic Zone radius in hydrostatic condition. Finally validation of this equation indicate that results predict the real Plastic Zone radius appropriately.

  • Prediction of Plastic Zone size around circular tunnels in non-hydrostatic stress field
    Elsevier, 2014
    Co-Authors: Bagheri Behnam, Soltani Fazlollah, Mohammadi Hamid
    Abstract:

    This paper discusses the calculation of Plastic Zone properties around circular tunnels to rock-masses that satisfy the Hoek–Brown failure criterion in non-hydrostatic condition, and reviews the calculation of Plastic Zone and displacement, and the basis of the convergence–confinement method in hydrostatic condition. A two-dimensional numerical simulation model was developed to gain understanding of the Plastic Zone Shape. Plastic Zone radius in any angles around the tunnel is analyzed and measured, using different values of overburden (four states) and stress ratio (nine states). Plastic Zone radius equations were obtained from fitting curve to data which are dependent on the values of stress ratio, angle and Plastic Zone radius in hydrostatic condition. Finally validation of this equation indicate that results predict the real Plastic Zone radius appropriately. Keywords: Plastic Zone radius, Convergence–confinement method, Non-hydrostatic condition, Stress rati

Tariq Khraishi - One of the best experts on this subject based on the ideXlab platform.

  • analytical solutions for crack tip Plastic Zone Shape using the von mises and tresca yield criteria effects of crack mode and stress condition
    Journal of Mechanics, 2004
    Co-Authors: P H Jing, Tariq Khraishi
    Abstract:

    Analytical closed-form solutions for the crack tip Plastic Zone Shape have been derived for a semi-infinite crack in an isotropic elastic-perfectly Plastic solid under both plane stress and plane strain conditions. Two yield criteria have been applied: the Von Mises and Tresca yield criteria. The solutions have been developed for crack modes I and III (mode II has been published previously). The results, which favorably compare to a limited number of existing experimental and analytical findings, indicate that the Tresca Zone is larger in size than the Von Mises Zone. Moreover, an interesting observation is that both Zones are generally much larger than the ones predicted by classical Irwin and Dugdale-Barenblatt solutions.

  • Closed-Form Solutions for the Mode ii Crack tip Plastic Zone Shape
    International Journal of Fracture, 2003
    Co-Authors: Peihua Jing, Tariq Khraishi, Larissa Gorbatikh
    Abstract:

    Analytical closed-form solutions for the Mode II crack tip Plastic Zone Shape have been derived for a semi-infinite crack in an isotropic elastic-Plastic solid under both plane stress and plane strain conditions. Two yield criteria have been applied: the Von Mises and Tresca yield criteria. The results indicate that the Tresca Zone is larger in size than the Von Mises Zone. The results also reveal an intricate dependence on Poisson's ratio in plane strain conditions.

Yuesheng Wang - One of the best experts on this subject based on the ideXlab platform.

  • three dimensional finite element analysis of residual magnetic field for ferromagnets under early damage
    Journal of Magnetism and Magnetic Materials, 2014
    Co-Authors: Kai Yao, Kai Shen, Zhengdao Wang, Yuesheng Wang
    Abstract:

    Abstract In this study, 3D finite element analysis is presented by calculating the residual magnetic field signals of ferromagnets under the Plastic deformation. The contour maps of tangential and normal RMF gradients are given, and the 3D effect is discussed. The results show that the tangential peak–peak amplitude and normal peak–vale amplitude are remarkably different in 2D and 3D simulations, but the tangential peak–peak width and normal peak–vale width are similar. Moreover, some key points are capable of capturing the Plastic-Zone Shape, especially when the lift-off is small enough. The present study suggests an effective defect identification method with Metal magnetic memory (MMM) technique.