The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform

Bernard Lorrain - One of the best experts on this subject based on the ideXlab platform.

  • stress concentration in a Circular Hole in composite plate
    Composite Structures, 2005
    Co-Authors: Lotfi Toubal, Moussa Karama, Bernard Lorrain
    Abstract:

    Abstract A non-contact measurement method, namely electronic speckle pattern interferometer (ESPI), was used to investigate the tensile strain field of a composites plate in the presence of stress concentrations caused by a geometrical defect consisting of Circular Hole. ESPI uses the principle of 3D speckle interferometry to measure the deformation and contour of the measuring field with sub-micrometer accuracy. The ESPI technique clearly revealed the strain concentrations near the singularity. The experimental results are compared with the predictions of a theoretical model previously developed by Lekhnitskii's and a finite element study.

  • stress concentration in a Circular Hole in composite plate
    Composite Structures, 2005
    Co-Authors: Lotfi Toubal, Moussa Karama, Bernard Lorrain
    Abstract:

    A non-contact measurement method, namely electronic speckle pattern interferometer (ESPI), was used to investigate the tensile strain field of a composites plate in the presence of stress concentrations caused by a geometrical defect consisting of Circular Hole. ESPI uses the principle of 3D speckle interferometry to measure the deformation and contour of the measuring field with submicrometer accuracy. The ESPI technique clearly revealed the strain concentrations near the singularity. The experimental results are compared with the predictions of a theoretical model previously developed by Lekhnitskii’s and a finite element study. � 2004 Elsevier Ltd. All rights reserved.

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

  • Strength of composite laminates with continuous fiber around a Circular Hole
    Composite Structures, 1992
    Co-Authors: Hung Jung Lin, Ya-jung Lee
    Abstract:

    Abstract The strength of glass fiber woven roving composites containing a Circular Hole was examined. Two types of Circular Hole — drilled, and moulded-in — were considered. Experiments were conducted on four different sizes of Hole diameter. Experimental results show that specimens with a moulded-in Circular Hole exhibit failure at a higher strength than those with a drilled Hole and exhibit different failure mode. A strength enhancement of 28–77% as compared with drilled laminates was observed. In addition to explaining the experimental results, a simple finite element model which used the concept of the stream line to simulate the fiber configuration was used in the stress analysis of laminates with moulded-in Circular Holes. The numerical results may explain why the laminates with moulded-in Holes are stronger than those with drilled Holes.

Xiangqiao Yan - One of the best experts on this subject based on the ideXlab platform.

  • A numerical analysis of a center Circular-Hole crack in a rectangular tensile sheet
    Applied Mathematics and Computation, 2015
    Co-Authors: Changqing Miao, Yintao Wei, Xiangqiao Yan
    Abstract:

    Abstract By using a hybrid displacement discontinuity method (a boundary element method), a center Circular-Hole crack in a rectangular tensile sheet is investigated in this paper. Detail numerical solutions of the stress intensity factors (SIFs) of the Circular-Hole crack are given, which can reveal the effect of geometric parameters of the cracked body on the SIFs. By comparing the calculated SIFs of the Circular-Hole crack with those of the center crack, the shielding and amplifying effects of the Circular Hole on the SIFs are found. The effects have perhaps an important meaning in engineering.

  • Interactions of two collinear Circular Hole cracks subjected to internal pressure
    Applied Mathematics and Computation, 2013
    Co-Authors: Changqing Miao, Yintao Wei, Xiangqiao Yan
    Abstract:

    By using a hybrid displacement discontinuity method, the interactions of two collinear Circular Hole cracks in infinite plate subjected to internal pressure are investigated in this paper. Numerical examples are included to illustrate that the numerical approach is very simple and effective for calculating the stress intensity factors (SIFs) of crack problems. In particular, the interaction problem of two collinear Circular Hole cracks is investigated in detail. Many numerical results are given and discussed. It is found that a Circular Hole has a shielding effect on the SIFs of crack(s) emanating from the Hole. The finding perhaps has an important meaning in engineering.

  • Rectangular tensile sheet with single edge crack or edge half-Circular-Hole crack
    Engineering Failure Analysis, 2007
    Co-Authors: Xiangqiao Yan
    Abstract:

    Abstract By using the displacement discontinuity method with crack-tip elements (a boundary element method) proposed recently by the author, this note presents the stress intensity factors (SIFs) of a rectangular tensile plate with single edge crack. Further this note studies the SIFs of crack emanating from an edge half-Circular Hole. By comparing the calculated SIFs of the single edge half-Circular-Hole crack with those of the single edge crack, a shielding effect of the half-Circular Hole on the SIFs of the single edge crack is discussed. It is found that the boundary element method is simple, yet accurate for calculating the SIFs of complex crack problems in finite plate.

  • cracks emanating from Circular Hole or square Hole in rectangular plate in tension
    Engineering Fracture Mechanics, 2006
    Co-Authors: Xiangqiao Yan
    Abstract:

    A numerical analysis of cracks emanating from a Circular Hole (Fig. 1) or a square Hole (Fig. 2) in rectangular plate in tension is performed by means of the displacement discontinuity method with crack-tip elements (a boundary element method) presented recently by the author. Detail solutions of the stress intensity factors (SIFs) of the two plane elastic crack problems are given, which can reveal the effect of geometric parameters of the cracked bodies on the SIFs. By comparing the SIFs of the two crack problems with those of the center crack in rectangular plate in tension (Fig. 3), in addition, an effect of the Circular Hole or the square Hole on the SIFs of the center crack is discussed in detail. The numerical results reported here also illustrate that the boundary element method is simple, yet accurate for calculating the SIFs of complex crack problems in finite plate.

I. S. Chernyshenko - One of the best experts on this subject based on the ideXlab platform.

  • elastoplastic state of an elliptical cylindrical shell with a Circular Hole
    International Applied Mechanics, 2017
    Co-Authors: E. A. Storozhuk, I. S. Chernyshenko, O V Pigol
    Abstract:

    Static problems for an elastoplastic elliptical cylindrical shell with a Circular Hole are formulated and a numerical method for solving it is developed. The basic equations are derived using the Kirchhoff–Love theory of deep shells and the theory of small elastoplastic strains. The method employs the method of additional stresses and the finite-element method. The influence of plastic strains and geometrical parameters of the shell subject to internal pressure on the distributions of stresses, strains, and displacements in the zone of their concentration is studied.

  • Stress–Strain State of Flexible Orthotropic Cylindrical Shells with a Reinforced Circular Hole
    International Applied Mechanics, 2015
    Co-Authors: V. A. Maksimyuk, E. A. Storozhuk, I. S. Chernyshenko
    Abstract:

    The stress–strain state of flexible orthotropic cylindrical shells with a reinforced Circular Hole under static loading is analyzed numerically. The incremental-loading procedure, modified Newton–Kantorovich method, and finite-element method are used. The effect of geometrical nonlinearity, the orthotropy of the material, and the stiffness of the reinforcement in a shell subject to uniform internal pressure on the distribution of stresses, strains, and displacements along the Hole edge and in the zone of their concentration is studied

  • Stress-strain state of a flexible spherical shell with an eccentric Circular Hole
    International Applied Mechanics, 2007
    Co-Authors: I. S. Chernyshenko, E. A. Storozhuk, I. B. Rudenko
    Abstract:

    The stress-strain state of thin flexible spherical shells weakened by an eccentric Circular Hole is analyzed. The shells are made of an isotropic homogeneous material and subjected to internal pressure. A problem formulation is given, and a method of numerical solution with allowance for geometrical nonlinearity is outlined. The distribution of displacements, strains, and stresses along the Hole boundary and in the region of their concentration is examined. The data obtained are compared with numerical solutions of the linear problem. The stress-strain state around the eccentric Circular Hole is analyzed with allowance for geometrical nonlinearity

  • stress concentration in an orthotropic plate with a Circular Hole under dynamic loading
    International Applied Mechanics, 2004
    Co-Authors: A I Zirka, M P Malezhik, I. S. Chernyshenko
    Abstract:

    The paper sets forth a photoelastic method for the determination of the dynamic stress concentration factor near a Hole in an orthotropic plate. The stress distribution at the periphery of a Circular Hole is analyzed. The stress concentration factors for orthotropic and isotropic plates under dynamic and statical loading are compared

Lotfi Toubal - One of the best experts on this subject based on the ideXlab platform.

  • stress concentration in a Circular Hole in composite plate
    Composite Structures, 2005
    Co-Authors: Lotfi Toubal, Moussa Karama, Bernard Lorrain
    Abstract:

    Abstract A non-contact measurement method, namely electronic speckle pattern interferometer (ESPI), was used to investigate the tensile strain field of a composites plate in the presence of stress concentrations caused by a geometrical defect consisting of Circular Hole. ESPI uses the principle of 3D speckle interferometry to measure the deformation and contour of the measuring field with sub-micrometer accuracy. The ESPI technique clearly revealed the strain concentrations near the singularity. The experimental results are compared with the predictions of a theoretical model previously developed by Lekhnitskii's and a finite element study.

  • stress concentration in a Circular Hole in composite plate
    Composite Structures, 2005
    Co-Authors: Lotfi Toubal, Moussa Karama, Bernard Lorrain
    Abstract:

    A non-contact measurement method, namely electronic speckle pattern interferometer (ESPI), was used to investigate the tensile strain field of a composites plate in the presence of stress concentrations caused by a geometrical defect consisting of Circular Hole. ESPI uses the principle of 3D speckle interferometry to measure the deformation and contour of the measuring field with submicrometer accuracy. The ESPI technique clearly revealed the strain concentrations near the singularity. The experimental results are compared with the predictions of a theoretical model previously developed by Lekhnitskii’s and a finite element study. � 2004 Elsevier Ltd. All rights reserved.