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Toyotarou Hiraishi - One of the best experts on this subject based on the ideXlab platform.

  • Fracture Strength of WC-12Co Thermal Sprayed Coating under Mixed Loading Mode I&III in Crack Surface Displacement
    Key Engineering Materials, 2004
    Co-Authors: Kenji Kaneko, Akira Ohmori, Toyotarou Hiraishi
    Abstract:

    Fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τstress plane. Stress distributions at Crack tip singular point on fractured Surfaces are analyzed by Finite-Element-Method and approximated by the expression σ＝KR-λ where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of the brittle coating is represented as K≧Kcr in the normal stress distribution even under mixed deformation mode I and III. A critical shear stress distribution for separation could also be obtained

  • study on fracture strength of wc 12co thermal sprayed coating under mixed loading mode i iii in Crack Surface Displacement
    Transactions of the Japan Society of Mechanical Engineers. A, 2004
    Co-Authors: Kenji Kaneko, Akira Ohmori, Toyotarou Hiraishi
    Abstract:

    In this study, fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τ stress plane. Stress distributions at Crack tip singular point on fractured Surfaces are analyzed by Finite-Element-Method and is approximated by the expressionσ=KR-1 where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of a brittle coating is represented as K≥Kcr in the normal stress distribution even under mixed deformation mode I with III. Delamination critical shear stress distribution could also be obtained.

H Seçil Artem - One of the best experts on this subject based on the ideXlab platform.

  • Axisymmetric Crack problem of thick-walled cylinder with loadings on Crack Surfaces
    Engineering Fracture Mechanics, 2008
    Co-Authors: Levent Aydin, H Seçil Artem
    Abstract:

    This study is concerned with the fracture of an infinite thick-walled cylinder. The inner Surface of the cylinder is stress free and the outer is rigidly fixed. The cylinder having a ring-shaped Crack located at the symmetry plane is subjected to distributed compressive load on its Surfaces. The Hankel and Fourier transform techniques are used for the solution of the field equations. By applying the boundary conditions, the singular integral equation in terms of Crack Surface Displacement derivative is derived. By using an appropriate quadrature formula, the integral equation is reduced to a system of linear algebraic equations. Numerical results are obtained for the stress intensity factors at the edges of the Crack, Surfaces of which are subjected to uniform, linear and parabolic load distributions.

  • An elastic hollow cylinder under axial tension containing a Crack and two rigid inclusions of ring shape
    Computers & Structures, 2002
    Co-Authors: H Seçil Artem, M. Rusen Gecit
    Abstract:

    This paper is concerned with the fracture of an axisymmetric hollow cylindrical bar containing rigid inclusions. The cylinder is under the action of uniformly distributed axial tension applied at infinity. The bar contains a ring-shaped Crack at the symmetry plane whose Surfaces are free of tractions and two ring-shaped rigid inclusions with negligible thickness symmetrically located on both sides of the Crack. It is assumed that the material of the cylinder is linearly elastic and isotropic. The mixed boundary conditions of the problem lead the analysis to a system of three singular integral equations for Crack Surface Displacement derivative and normal and shearing stress jumps on rigid inclusions. These integral equations are solved numerically and the stress intensity factors are calculated.

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

  • A generalised solution for the Crack Surface Displacement of mode I two-dimensional part-elliptical Crack
    International Journal of Fracture, 1993
    Co-Authors: G. S. Wang
    Abstract:

    A generalised approximate Crack Surface Displacement solution for the two-dimensional part-elliptical mode I Crack was developed. This solution includes the Surface Crack, corner Crack and embedded Crack, which is subjected to the arbitrary Crack Surface pressure. The Crack Surface Displacement is derived from stress intensity factor solution and corresponding Crack Surface pressure distribution. Comparisons of the solution with accurate solutions showed that rather high accuracy has been achieved with the developed solution for various Surface, embedded and corner Crack problems. This solution can be used to derive three-dimensional weight functions as long as the stress intensity factor and the corresponding Crack Surface pressure are available for arbitrary mode I problems.

  • A solution for SIFs of part-elliptical Cracks based on approximate Crack Surface Displacement and energy method
    International Journal of Fracture, 1992
    Co-Authors: G. S. Wang
    Abstract:

    A procedure has been developed to derive stress intensity factors (SIFs) for part-elliptical Cracks based on an approximate Crack Surface Displacement mode assumption for general configurations. The Crack Surface Displacement mode is composed of available 2D Crack Surface Displacement modes at intersections of the Crack Surface and boundaries, or in symmetry planes. Along with the obtained Crack Surface Displacement mode, SIFs are determined by the magnitude of the Crack Surface Displacement derived from energy release rate for virtual Crack increments. The procedure was analytically verified with the exact solution for an embedded Crack in an infinite body subjected to uniform Crack Surface pressure. Several examples show the obtained results in acceptable agreements with available solutions.

  • SIFs of part-through mode I Cracks for uniform Crack Surface pressure
    Engineering Fracture Mechanics, 1992
    Co-Authors: G. S. Wang
    Abstract:

    Abstract A procedure has been developed to derive the stress intensity factors (SIFs) for part-elliptical Cracks subjected to uniform Crack Surface pressure based on an approximate Crack Surface Displacement mode assumption. The Crack Surface Displacement mode is composed of 2D Crack Surface Displacement modes at intersections of the Crack Surface and boundaries, or at symmetry planes, which are determined by a line-spring method. Along with the obtained Crack Surface Displacement, SIFs can be determined by the magnitude of the Crack Surface Displacement derived from the energy release relations for virtual Crack growths. The procedure was verified with the exact SIF result for an embedded Crack in an infinite body subjected to uniform Crack Surface pressure. Examples show that the obtained results are in good agreement with available solutions.

  • Weight function estimation of sif for mode. I: Part-elliptical Crack under arbitrary load
    Engineering Fracture Mechanics, 1992
    Co-Authors: G. S. Wang
    Abstract:

    Abstract An approximate solution for stress intensity factors (SIFs) of a Mode I part-elliptical Crack under complex load was developed. The solution is based on a weight method to compute the stress intensity factor for a complex load by a reference SIF for a simple load case. A previously developed Crack Surface Displacement solution [G.S. Wang, Approximate weight functions for RMS-averaged stress intensity factor, submitted to Int. J. Fracture] is used in the solution. Both self-consistency examinations and comparisons with available solutions for various Crack geometries and loading cases show that errors of the SIFs computed by the solution are within several percent.

  • Crack Surface Displacements for mode i one dimensional Cracks in general two dimensional geometry
    Engineering Fracture Mechanics, 1991
    Co-Authors: G. S. Wang
    Abstract:

    Abstract A Crack Surface Displacement solution for Mode I one-dimensional Cracks under arbitrary Crack Surface loads in general two-dimensional geometry is presented. The solution is based on the stress intensity factors computed with the boundary element method [G. S. Wang and A. F. Blom, FFA TN 1990-10, Aeronautical Research Institute of Sweden (1990)], and the corresponding approximate weight functions [G. S. Wang and A. F. Blom, FFA TN 1996-17, Aeronautical Research Institute of Sweden (1990)]. Comparisons have been, made between the present solution, exact solutions and acceptable solutions. It has been shown that the present solution gives the Crack Surface Displacements with excellent accuracy.

Kenji Kaneko - One of the best experts on this subject based on the ideXlab platform.

  • Fracture Strength of WC-12Co Thermal Sprayed Coating under Mixed Loading Mode I&III in Crack Surface Displacement
    Key Engineering Materials, 2004
    Co-Authors: Kenji Kaneko, Akira Ohmori, Toyotarou Hiraishi
    Abstract:

    Fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τstress plane. Stress distributions at Crack tip singular point on fractured Surfaces are analyzed by Finite-Element-Method and approximated by the expression σ＝KR-λ where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of the brittle coating is represented as K≧Kcr in the normal stress distribution even under mixed deformation mode I and III. A critical shear stress distribution for separation could also be obtained

  • study on fracture strength of wc 12co thermal sprayed coating under mixed loading mode i iii in Crack Surface Displacement
    Transactions of the Japan Society of Mechanical Engineers. A, 2004
    Co-Authors: Kenji Kaneko, Akira Ohmori, Toyotarou Hiraishi
    Abstract:

    In this study, fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τ stress plane. Stress distributions at Crack tip singular point on fractured Surfaces are analyzed by Finite-Element-Method and is approximated by the expressionσ=KR-1 where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of a brittle coating is represented as K≥Kcr in the normal stress distribution even under mixed deformation mode I with III. Delamination critical shear stress distribution could also be obtained.

Akira Ohmori - One of the best experts on this subject based on the ideXlab platform.

  • Fracture Strength of WC-12Co Thermal Sprayed Coating under Mixed Loading Mode I&III in Crack Surface Displacement
    Key Engineering Materials, 2004
    Co-Authors: Kenji Kaneko, Akira Ohmori, Toyotarou Hiraishi
    Abstract:

    Fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τstress plane. Stress distributions at Crack tip singular point on fractured Surfaces are analyzed by Finite-Element-Method and approximated by the expression σ＝KR-λ where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of the brittle coating is represented as K≧Kcr in the normal stress distribution even under mixed deformation mode I and III. A critical shear stress distribution for separation could also be obtained

  • study on fracture strength of wc 12co thermal sprayed coating under mixed loading mode i iii in Crack Surface Displacement
    Transactions of the Japan Society of Mechanical Engineers. A, 2004
    Co-Authors: Kenji Kaneko, Akira Ohmori, Toyotarou Hiraishi
    Abstract:

    In this study, fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τ stress plane. Stress distributions at Crack tip singular point on fractured Surfaces are analyzed by Finite-Element-Method and is approximated by the expressionσ=KR-1 where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of a brittle coating is represented as K≥Kcr in the normal stress distribution even under mixed deformation mode I with III. Delamination critical shear stress distribution could also be obtained.