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Mike I Jones - One of the best experts on this subject based on the ideXlab platform.

  • Interlaminar Failure of unidirectional glass/epoxy due to combined through thickness shear and tension
    Composites Part A: Applied Science and Manufacturing, 1996
    Co-Authors: Michael R Wisnom, Z Petrossian, Mike I Jones
    Abstract:

    A test specimen in the form of a hoop with two 90° curved sections is described. When loaded in three point bending, both Interlaminar tensile and shear stresses arise in the curved sections. Maximum tensile and shear stresses occur at similar locations, allowing the combined effect of these stress components to be investigated. Changing the geometry of the specimen alters the ratio between Interlaminar shear and tension. Experimental results are presented for two sets of unidirectional glass fibre/epoxy specimens. It is shown that it is possible for specimens subjected to combined Interlaminar tension and shear to withstand higher stresses than when subjected to only tension. This is believed to be due to the smaller volume subjected to the maximum tensile stress as a result of the stress gradient along the length of the specimen. An approach is presented to account for this effect based on Weibull statistical theory and a quadratic interaction equation between Interlaminar tension and shear. Using stresses from finite element analysis, satisfactory predictions of the strength of the hoop specimens can be made.

  • Interlaminar Failure of unidirectional glass epoxy due to combined through thickness shear and tension
    Composites Part A-applied Science and Manufacturing, 1996
    Co-Authors: Michael R Wisnom, Z Petrossian, Mike I Jones
    Abstract:

    A test specimen in the form of a hoop with two 90° curved sections is described. When loaded in three point bending, both Interlaminar tensile and shear stresses arise in the curved sections. Maximum tensile and shear stresses occur at similar locations, allowing the combined effect of these stress components to be investigated. Changing the geometry of the specimen alters the ratio between Interlaminar shear and tension. Experimental results are presented for two sets of unidirectional glass fibre/epoxy specimens. It is shown that it is possible for specimens subjected to combined Interlaminar tension and shear to withstand higher stresses than when subjected to only tension. This is believed to be due to the smaller volume subjected to the maximum tensile stress as a result of the stress gradient along the length of the specimen. An approach is presented to account for this effect based on Weibull statistical theory and a quadratic interaction equation between Interlaminar tension and shear. Using stresses from finite element analysis, satisfactory predictions of the strength of the hoop specimens can be made.

Michael R Wisnom - One of the best experts on this subject based on the ideXlab platform.

  • Interlaminar Failure of unidirectional glass/epoxy due to combined through thickness shear and tension
    Composites Part A: Applied Science and Manufacturing, 1996
    Co-Authors: Michael R Wisnom, Z Petrossian, Mike I Jones
    Abstract:

    A test specimen in the form of a hoop with two 90° curved sections is described. When loaded in three point bending, both Interlaminar tensile and shear stresses arise in the curved sections. Maximum tensile and shear stresses occur at similar locations, allowing the combined effect of these stress components to be investigated. Changing the geometry of the specimen alters the ratio between Interlaminar shear and tension. Experimental results are presented for two sets of unidirectional glass fibre/epoxy specimens. It is shown that it is possible for specimens subjected to combined Interlaminar tension and shear to withstand higher stresses than when subjected to only tension. This is believed to be due to the smaller volume subjected to the maximum tensile stress as a result of the stress gradient along the length of the specimen. An approach is presented to account for this effect based on Weibull statistical theory and a quadratic interaction equation between Interlaminar tension and shear. Using stresses from finite element analysis, satisfactory predictions of the strength of the hoop specimens can be made.

  • Interlaminar Failure of unidirectional glass epoxy due to combined through thickness shear and tension
    Composites Part A-applied Science and Manufacturing, 1996
    Co-Authors: Michael R Wisnom, Z Petrossian, Mike I Jones
    Abstract:

    A test specimen in the form of a hoop with two 90° curved sections is described. When loaded in three point bending, both Interlaminar tensile and shear stresses arise in the curved sections. Maximum tensile and shear stresses occur at similar locations, allowing the combined effect of these stress components to be investigated. Changing the geometry of the specimen alters the ratio between Interlaminar shear and tension. Experimental results are presented for two sets of unidirectional glass fibre/epoxy specimens. It is shown that it is possible for specimens subjected to combined Interlaminar tension and shear to withstand higher stresses than when subjected to only tension. This is believed to be due to the smaller volume subjected to the maximum tensile stress as a result of the stress gradient along the length of the specimen. An approach is presented to account for this effect based on Weibull statistical theory and a quadratic interaction equation between Interlaminar tension and shear. Using stresses from finite element analysis, satisfactory predictions of the strength of the hoop specimens can be made.

Z Petrossian - One of the best experts on this subject based on the ideXlab platform.

  • Interlaminar Failure of unidirectional glass/epoxy due to combined through thickness shear and tension
    Composites Part A: Applied Science and Manufacturing, 1996
    Co-Authors: Michael R Wisnom, Z Petrossian, Mike I Jones
    Abstract:

    A test specimen in the form of a hoop with two 90° curved sections is described. When loaded in three point bending, both Interlaminar tensile and shear stresses arise in the curved sections. Maximum tensile and shear stresses occur at similar locations, allowing the combined effect of these stress components to be investigated. Changing the geometry of the specimen alters the ratio between Interlaminar shear and tension. Experimental results are presented for two sets of unidirectional glass fibre/epoxy specimens. It is shown that it is possible for specimens subjected to combined Interlaminar tension and shear to withstand higher stresses than when subjected to only tension. This is believed to be due to the smaller volume subjected to the maximum tensile stress as a result of the stress gradient along the length of the specimen. An approach is presented to account for this effect based on Weibull statistical theory and a quadratic interaction equation between Interlaminar tension and shear. Using stresses from finite element analysis, satisfactory predictions of the strength of the hoop specimens can be made.

  • Interlaminar Failure of unidirectional glass epoxy due to combined through thickness shear and tension
    Composites Part A-applied Science and Manufacturing, 1996
    Co-Authors: Michael R Wisnom, Z Petrossian, Mike I Jones
    Abstract:

    A test specimen in the form of a hoop with two 90° curved sections is described. When loaded in three point bending, both Interlaminar tensile and shear stresses arise in the curved sections. Maximum tensile and shear stresses occur at similar locations, allowing the combined effect of these stress components to be investigated. Changing the geometry of the specimen alters the ratio between Interlaminar shear and tension. Experimental results are presented for two sets of unidirectional glass fibre/epoxy specimens. It is shown that it is possible for specimens subjected to combined Interlaminar tension and shear to withstand higher stresses than when subjected to only tension. This is believed to be due to the smaller volume subjected to the maximum tensile stress as a result of the stress gradient along the length of the specimen. An approach is presented to account for this effect based on Weibull statistical theory and a quadratic interaction equation between Interlaminar tension and shear. Using stresses from finite element analysis, satisfactory predictions of the strength of the hoop specimens can be made.

J. Harding - One of the best experts on this subject based on the ideXlab platform.

  • Effect of strain rate on the fracture process in Interlaminar shear specimens of carbon fibre-reinforced laminates
    Composites Part A: Applied Science and Manufacturing, 1997
    Co-Authors: M.j. Hiley, L. Dong, J. Harding
    Abstract:

    Crack detection gauges have been used to determine the start of catastrophic shear Failure and to follow its propagation on the Interlaminar plane in single-lap shear specimens of unidirectional carbon/epoxy and carbon/PEEK laminates loaded at both quasi-static and impact rates. The Interlaminar Failure surfaces have been examined using optical and scanning electron microscopy. For carbon/epoxy specimens shear cusps characteristic of mode II shear Failure were observed, while for carbon/PEEK specimens a small degree of plastic matrix deformation, typical of fast fracture, was obtained. These results are used to interpret those obtained from the single-lap shear specimen and to discuss the significance of previously published results on the rate dependence of the Interlaminar shear strength for carbon/epoxy and carbon/PEEK laminates.

  • a single lap shear specimen for determining the effect of strain rate on the Interlaminar shear strength of carbon fibre reinforced laminates
    Composites, 1994
    Co-Authors: L. Dong, J. Harding
    Abstract:

    Abstract A new design of single-lap shear specimen for determining the effect of loading rate on the Interlaminar shear strength of laminated composites is described. Finite element analyses are used to optimize the specimen geometry and minimize the variation in the shear stress and the magnitude of the normal stress along the Interlaminar Failure plane. Experimental results are obtained at a quasi-static and an impact rate of loading for the Interlaminar shear strength parallel to the fibres in both unidirectional carbon/epoxy and unidirectional carbon/polyetheretherketone ( peek ) laminates and at interfaces across which the fibre orientation is 0°/90° and ±45°. Results for carbon/epoxy laminates are compared with those from an earlier investigation using a double-lap specimen geometry and show a similar small dependence on loading rate. No significant effect of loading rate was observed for the carbon/ peek laminates.

Ulf Edlund - One of the best experts on this subject based on the ideXlab platform.