The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform

Zhongmin Xiao - One of the best experts on this subject based on the ideXlab platform.

  • On elastic–Plastic fracture behavior of a bi-layered composite plate with a sub-interface crack under mixed mode loading
    Composites Part B: Engineering, 2014
    Co-Authors: Zhongmin Xiao, Soon Keat Tan, M. Fan
    Abstract:

    A generalized Irwin model is proposed to investigate elastic–Plastic fracture behavior of a bi-layered composite plate with a sub-interface crack under combined tension and shear loading. The dependence of the stress intensity factors, the Plastic Zone Size, the effective stress intensity factor and the crack tip opening displacement on the crack depth h, the Dundurs’ parameters and the phase angle θ is discussed in detail. Numerical results show that in most cases, if the crack is embedded in a stiffer material, when the crack is close to the interface, the Plastic Zone Size and the crack tip opening displacement will increase. On the contrary, if the crack is embedded in a softer material, when the crack is close to the interface, the Plastic Zone Size and the crack tip opening displacement will decrease.

  • Elastic-Plastic fracture behavior of a radial matrix crack interacting with a circle inclusion with generalized Irwin corrections
    Acta Mechanica, 2013
    Co-Authors: Zhongmin Xiao, Soon Keat Tan, Yao Zhang
    Abstract:

    A generalized Irwin Plastic Zone model is proposed to investigate the interaction problem for a circular inclusion embedded in an elastic–Plastic matrix that contains a radial crack, oriented at an arbitrary angle from a remote load. The distributed dislocation technology is applied to formulate the current problem. The effective stress intensity factors, the Plastic Zone Size, and the crack tip opening displacement are evaluated by solving the formulated singular integral equations. In the numerical examples, the inclusion is taken as a void and a rigid body. The effects of the crack angle and the inclusion–crack distance (the distance from the inclusion center to the crack center) on the effective stress intensity factors, the Plastic Zone Size, and the crack tip opening displacement are discussed in detail. Numerical results show that if the crack angle is not large, the values of the Plastic Zone Size and the crack tip opening displacement are less than the corresponding values in the homogenous case when the inclusion is a rigid body; when the inclusion is a void, these values are larger than the corresponding values in the homogenous case.

  • An interface crack under biaxial loading with Dugdale Plastic Zone corrections in layered composite materials
    Engineering Fracture Mechanics, 2013
    Co-Authors: Zhongmin Xiao, Soon Keat Tan
    Abstract:

    Abstract With Plastic Zone corrections, the problem of an interface crack between two dissimilar materials under a remote biaxial load is investigated. The mixed-mode Dugdale model is used to examine the Plastic Zone Size and the crack tip opening displacement. In the numerical examples, effects of the biaxial loading and Dundurs’ parameters on the Plastic Zone Size and the crack tip opening displacement are studied. The results show that the compressive loading parallel to the crack line will increase the values of the Plastic Zone Size and the crack tip opening displacement.

  • On the fracture behaviour of an interface crack with Plastic Zone corrections
    Mechanics of Materials, 2013
    Co-Authors: Zhongmin Xiao, Soon Keat Tan
    Abstract:

    Abstract In this paper, the mixed-mode Dugdale model is extended to investigate an interface crack problem. The Plastic Zone Size and the crack tip opening displacement for an interface crack between two dissimilar materials under remote uniform tensile loading are examined. In the solution procedure, continuously distributed edge dislocations are applied to simulate the crack, and the physical problem is formulated into the singular integral-equation of 2nd kind. In the numerical examples, the effects of the normalized uniform tensile loads and the Dundurs’ parameters β on the normalized Plastic Zone Size and the normalized crack tip opening displacement are analyzed in detail. The obtained results show that the normalized Plastic Zone Size and the normalized crack tip opening displacement are symmetrical about the axis β  = 0. Further, the relationships among the Plastic Zone Size, the crack tip opening displacement and Dundurs’ parameters are curve-fitted as two polynomial functions which are highly user-friend for engineers in solving practical interface crack problems.

  • Elastic–Plastic analysis of a sub-interface crack in a coating-substrate composite
    International Journal of Solids and Structures, 2013
    Co-Authors: J Zhuang, Zhongmin Xiao
    Abstract:

    AbstractIn the present work, elastic–Plastic analysis of a crack paralleling a bonded plane interface between a coating and a semi-infinite substrate is carried out. The sub-interface crack is simulated by continuously distributed dislocations. The mixed mode Dugdale model is used to investigate the Plastic Zone Sizes and the crack tip opening displacement. In the numerical examples, a uniform tensile load on the crack surfaces is considered, and the dependence of the Plastic Zone Size and the crack tip opening displacement on the crack depth, the coating thickness and material properties is analyzed in detail. The numerical results show that a thinner coating will enlarge the Plastic Zone Size and the crack tip opening displacement. And if the crack is far away from the interface, the values of the Plastic Zone Size and the crack tip opening displacement tend to the corresponding values when the crack is embedded in a homogenous material

Soon Keat Tan - One of the best experts on this subject based on the ideXlab platform.

  • On elastic–Plastic fracture behavior of a bi-layered composite plate with a sub-interface crack under mixed mode loading
    Composites Part B: Engineering, 2014
    Co-Authors: Zhongmin Xiao, Soon Keat Tan, M. Fan
    Abstract:

    A generalized Irwin model is proposed to investigate elastic–Plastic fracture behavior of a bi-layered composite plate with a sub-interface crack under combined tension and shear loading. The dependence of the stress intensity factors, the Plastic Zone Size, the effective stress intensity factor and the crack tip opening displacement on the crack depth h, the Dundurs’ parameters and the phase angle θ is discussed in detail. Numerical results show that in most cases, if the crack is embedded in a stiffer material, when the crack is close to the interface, the Plastic Zone Size and the crack tip opening displacement will increase. On the contrary, if the crack is embedded in a softer material, when the crack is close to the interface, the Plastic Zone Size and the crack tip opening displacement will decrease.

  • Elastic-Plastic fracture behavior of a radial matrix crack interacting with a circle inclusion with generalized Irwin corrections
    Acta Mechanica, 2013
    Co-Authors: Zhongmin Xiao, Soon Keat Tan, Yao Zhang
    Abstract:

    A generalized Irwin Plastic Zone model is proposed to investigate the interaction problem for a circular inclusion embedded in an elastic–Plastic matrix that contains a radial crack, oriented at an arbitrary angle from a remote load. The distributed dislocation technology is applied to formulate the current problem. The effective stress intensity factors, the Plastic Zone Size, and the crack tip opening displacement are evaluated by solving the formulated singular integral equations. In the numerical examples, the inclusion is taken as a void and a rigid body. The effects of the crack angle and the inclusion–crack distance (the distance from the inclusion center to the crack center) on the effective stress intensity factors, the Plastic Zone Size, and the crack tip opening displacement are discussed in detail. Numerical results show that if the crack angle is not large, the values of the Plastic Zone Size and the crack tip opening displacement are less than the corresponding values in the homogenous case when the inclusion is a rigid body; when the inclusion is a void, these values are larger than the corresponding values in the homogenous case.

  • An interface crack under biaxial loading with Dugdale Plastic Zone corrections in layered composite materials
    Engineering Fracture Mechanics, 2013
    Co-Authors: Zhongmin Xiao, Soon Keat Tan
    Abstract:

    Abstract With Plastic Zone corrections, the problem of an interface crack between two dissimilar materials under a remote biaxial load is investigated. The mixed-mode Dugdale model is used to examine the Plastic Zone Size and the crack tip opening displacement. In the numerical examples, effects of the biaxial loading and Dundurs’ parameters on the Plastic Zone Size and the crack tip opening displacement are studied. The results show that the compressive loading parallel to the crack line will increase the values of the Plastic Zone Size and the crack tip opening displacement.

  • On the fracture behaviour of an interface crack with Plastic Zone corrections
    Mechanics of Materials, 2013
    Co-Authors: Zhongmin Xiao, Soon Keat Tan
    Abstract:

    Abstract In this paper, the mixed-mode Dugdale model is extended to investigate an interface crack problem. The Plastic Zone Size and the crack tip opening displacement for an interface crack between two dissimilar materials under remote uniform tensile loading are examined. In the solution procedure, continuously distributed edge dislocations are applied to simulate the crack, and the physical problem is formulated into the singular integral-equation of 2nd kind. In the numerical examples, the effects of the normalized uniform tensile loads and the Dundurs’ parameters β on the normalized Plastic Zone Size and the normalized crack tip opening displacement are analyzed in detail. The obtained results show that the normalized Plastic Zone Size and the normalized crack tip opening displacement are symmetrical about the axis β  = 0. Further, the relationships among the Plastic Zone Size, the crack tip opening displacement and Dundurs’ parameters are curve-fitted as two polynomial functions which are highly user-friend for engineers in solving practical interface crack problems.

  • An interface crack in a coating-substrate composite with mixed-mode Dugdale corrections
    International Journal of Fracture, 2012
    Co-Authors: Zhongmin Xiao, Soon Keat Tan
    Abstract:

    Considering both plane stress and plane strain conditions, the Plastic Zone Size and the crack tip opening displacement of an interface crack between a coating and a semi-infinite substrate under a normal load on the crack surfaces are investigated by the mixed-mode Dugdale model. In the model, stresses applied in the Plastic Zones satisfy the Von Mises yield criterion. The Plastic Zone Size can be calculated by satisfying the condition that the complex stress intensity factors vanish. After the Plastic Zone Size is solved, the crack tip opening displacement can be obtained by dislocation theories. In numerical examples, a uniform load is considered, and the effects of the normalized elastic modulus (the ratio of the elastic modulus of the coating to the elastic modulus of the substrate) and the normalized crack depth (the ratio of the coating thickness to the interface crack length) on the normalized Plastic Zone Size and the normalized crack tip opening displacement are examined. Numerical examples show in the case of thin coatings, the value of the normalized Plastic Zone Size decreases with increasing the normalized elastic modulus.

Sanboh Lee - One of the best experts on this subject based on the ideXlab platform.

  • The effect of superdislocation on fracture: Dislocation‐free Zone in the front of a semi‐infinite crack tip
    Journal of Applied Physics, 1992
    Co-Authors: Sham-tsong Shiue, Sanboh Lee
    Abstract:

    The effect of superdislocation on mode II or mode III fracture has been investigated. The Plastic Zone between a semi‐infinite crack tip and a superdislocation with a dislocation‐free Zone is simulated by a continuous dislocation distribution. The dislocation distribution functions in the crack and Plastic Zone are analytically derived. A close form of the number of dislocations in the Plastic Zone and stress field along the x axis are obtained. From the stress field, the stress intensity factor KIII at the crack tip and stress concentration at the superdislocation are available. When the distance between crack tip and superdislocation is larger than the Plastic Zone Size, the stress intensity factor is proportional to the square root of Plastic Zone Size KIII, but is inversely proportional to the distance between crack tip and superdislocation. On the other hand, when the distance between crack tip and superdislocation is almost the same as the Plastic Zone Size, the stress intensity factor is inversely ...

  • the effect of superdislocation on fracture dislocation free Zone in the front of a semi infinite crack tip
    Journal of Applied Physics, 1992
    Co-Authors: Sham-tsong Shiue, Sanboh Lee
    Abstract:

    The effect of superdislocation on mode II or mode III fracture has been investigated. The Plastic Zone between a semi‐infinite crack tip and a superdislocation with a dislocation‐free Zone is simulated by a continuous dislocation distribution. The dislocation distribution functions in the crack and Plastic Zone are analytically derived. A close form of the number of dislocations in the Plastic Zone and stress field along the x axis are obtained. From the stress field, the stress intensity factor KIII at the crack tip and stress concentration at the superdislocation are available. When the distance between crack tip and superdislocation is larger than the Plastic Zone Size, the stress intensity factor is proportional to the square root of Plastic Zone Size KIII, but is inversely proportional to the distance between crack tip and superdislocation. On the other hand, when the distance between crack tip and superdislocation is almost the same as the Plastic Zone Size, the stress intensity factor is inversely ...

Xavier Feaugas - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of the Plastic Zone Size ahead of repaired cracks with bonded composite patch of metallic aircraft structures
    Computational Materials Science, 2009
    Co-Authors: Wahid Oudad, S. Touzain, Bel Abbes Bachir Bouiadjra, M Belhouari, Xavier Feaugas
    Abstract:

    In this study, the three-dimensional and non-linear finite element method is used to estimate the performance of the bonded composite repair of metallic aircraft structures by analyzing the Plastic Zone Size ahead of repaired cracks. Several calculations have been realized to extract the Plasticized elements around the crack tip of repaired crack. The obtained results show that the presence of the composite patch reduces considerably the Size of the Plastic Zone ahead of the crack. The effects of the adhesive properties and the patch thickness on the Plastic Zone Size ahead of repaired cracks were analyzed.

Sham-tsong Shiue - One of the best experts on this subject based on the ideXlab platform.

  • The effect of superdislocation on fracture: Dislocation-free Zone in the front of a semi-infinite crack tip
    American Institute of Physics, 2011
    Co-Authors: Sham-tsong Shiue
    Abstract:

    [[abstract]]The effect of superdislocation on mode II or mode III fracture has been investigated. The Plastic Zone between a semi-infinite crack tip and a superdislocation with a dislocation-free Zone is simulated by a continuous dislocation distribution. The dislocation distribution functions in the crack and Plastic Zone are analytically derived. A close form of the number of dislocations in the Plastic Zone and stress field along the x axis are obtained. From the stress field, the stress intensity factor KIII at the crack tip and stress concentration at the superdislocation are available. When the distance between crack tip and superdislocation is larger than the Plastic Zone Size, the stress intensity factor is proportional to the square root of Plastic Zone Size KIII, but is inversely proportional to the distance between crack tip and superdislocation. On the other hand, when the distance between crack tip and superdislocation is almost the same as the Plastic Zone Size, the stress intensity factor is inversely proportional to the square root of distance between crack tip and superdislocation. It is also found that the applied stress is determined by the superdislocation. Finally, the results can be reduced to several special cases.[[fileno]]2020330010051[[department]]材料科學工程學

  • The effect of superdislocation on fracture: Dislocation‐free Zone in the front of a semi‐infinite crack tip
    Journal of Applied Physics, 1992
    Co-Authors: Sham-tsong Shiue, Sanboh Lee
    Abstract:

    The effect of superdislocation on mode II or mode III fracture has been investigated. The Plastic Zone between a semi‐infinite crack tip and a superdislocation with a dislocation‐free Zone is simulated by a continuous dislocation distribution. The dislocation distribution functions in the crack and Plastic Zone are analytically derived. A close form of the number of dislocations in the Plastic Zone and stress field along the x axis are obtained. From the stress field, the stress intensity factor KIII at the crack tip and stress concentration at the superdislocation are available. When the distance between crack tip and superdislocation is larger than the Plastic Zone Size, the stress intensity factor is proportional to the square root of Plastic Zone Size KIII, but is inversely proportional to the distance between crack tip and superdislocation. On the other hand, when the distance between crack tip and superdislocation is almost the same as the Plastic Zone Size, the stress intensity factor is inversely ...

  • the effect of superdislocation on fracture dislocation free Zone in the front of a semi infinite crack tip
    Journal of Applied Physics, 1992
    Co-Authors: Sham-tsong Shiue, Sanboh Lee
    Abstract:

    The effect of superdislocation on mode II or mode III fracture has been investigated. The Plastic Zone between a semi‐infinite crack tip and a superdislocation with a dislocation‐free Zone is simulated by a continuous dislocation distribution. The dislocation distribution functions in the crack and Plastic Zone are analytically derived. A close form of the number of dislocations in the Plastic Zone and stress field along the x axis are obtained. From the stress field, the stress intensity factor KIII at the crack tip and stress concentration at the superdislocation are available. When the distance between crack tip and superdislocation is larger than the Plastic Zone Size, the stress intensity factor is proportional to the square root of Plastic Zone Size KIII, but is inversely proportional to the distance between crack tip and superdislocation. On the other hand, when the distance between crack tip and superdislocation is almost the same as the Plastic Zone Size, the stress intensity factor is inversely ...