The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform

W M Banks - One of the best experts on this subject based on the ideXlab platform.

  • an experimental study of damage accumulation in balanced cfrp laminates due to repeated impact
    Composite Structures, 2008
    Co-Authors: Opukuro Davidwest, David Nash, W M Banks
    Abstract:

    The behaviour of balanced laminates (symmetric, antisymmetric and asymmetric) under repeated low energy hits of a 12.1 mm hemispheric impactor was evaluated. The resistance to the impulsive force was found to be influenced by the stacking sequence and the crack path through the laminate. The symmetric plate with different ply directions proved to have best resistance to impact. The rate of damage progression in the event was characterised by an equation from the energy profile that correlates the propagation energy and time. This was differentiated to give the rate of damage evolution. A comparison of the bending stiffness obtained from the force-Displacement Plot of the first impact, revealed that the symmetric composite had the highest stiffness. Noted at perforation were fibre breakage and matrix cracking.

Serge Abrate - One of the best experts on this subject based on the ideXlab platform.

  • Delamination threshold loads for low velocity impact on composite laminates
    Composites Part A: Applied Science and Manufacturing, 2000
    Co-Authors: Gregory A Schoeppner, Serge Abrate
    Abstract:

    An investigation of the low velocity impact load level at which a composite laminate will delaminate is presented. The delamination threshold load is described as the load level, obtained from the load-time history or load-Displacement Plot, at which a sudden load drop occurs due to specimen stiffness loss as a result of laminate level damage. Approximately 500 low velocity impact load-time histories from the Air Force Research Laboratory (AFRL) Low Velocity Impact Database are used to investigate the delamination threshold load. The database contains laminate impact test data for graphite/epoxy (AS4/3501-6), graphite/PEEK (AS4/APC-2), and graphite/BMI (IM7/5260) material systems. The delamination threshold load observations are compared to C-scan damage measurements of impacted specimens to determine if the sudden load drop corresponds to delamination development.

Opukuro Davidwest - One of the best experts on this subject based on the ideXlab platform.

  • an experimental study of damage accumulation in balanced cfrp laminates due to repeated impact
    Composite Structures, 2008
    Co-Authors: Opukuro Davidwest, David Nash, W M Banks
    Abstract:

    The behaviour of balanced laminates (symmetric, antisymmetric and asymmetric) under repeated low energy hits of a 12.1 mm hemispheric impactor was evaluated. The resistance to the impulsive force was found to be influenced by the stacking sequence and the crack path through the laminate. The symmetric plate with different ply directions proved to have best resistance to impact. The rate of damage progression in the event was characterised by an equation from the energy profile that correlates the propagation energy and time. This was differentiated to give the rate of damage evolution. A comparison of the bending stiffness obtained from the force-Displacement Plot of the first impact, revealed that the symmetric composite had the highest stiffness. Noted at perforation were fibre breakage and matrix cracking.

David Nash - One of the best experts on this subject based on the ideXlab platform.

  • an experimental study of damage accumulation in balanced cfrp laminates due to repeated impact
    Composite Structures, 2008
    Co-Authors: Opukuro Davidwest, David Nash, W M Banks
    Abstract:

    The behaviour of balanced laminates (symmetric, antisymmetric and asymmetric) under repeated low energy hits of a 12.1 mm hemispheric impactor was evaluated. The resistance to the impulsive force was found to be influenced by the stacking sequence and the crack path through the laminate. The symmetric plate with different ply directions proved to have best resistance to impact. The rate of damage progression in the event was characterised by an equation from the energy profile that correlates the propagation energy and time. This was differentiated to give the rate of damage evolution. A comparison of the bending stiffness obtained from the force-Displacement Plot of the first impact, revealed that the symmetric composite had the highest stiffness. Noted at perforation were fibre breakage and matrix cracking.

Gregory A Schoeppner - One of the best experts on this subject based on the ideXlab platform.

  • Delamination threshold loads for low velocity impact on composite laminates
    Composites Part A: Applied Science and Manufacturing, 2000
    Co-Authors: Gregory A Schoeppner, Serge Abrate
    Abstract:

    An investigation of the low velocity impact load level at which a composite laminate will delaminate is presented. The delamination threshold load is described as the load level, obtained from the load-time history or load-Displacement Plot, at which a sudden load drop occurs due to specimen stiffness loss as a result of laminate level damage. Approximately 500 low velocity impact load-time histories from the Air Force Research Laboratory (AFRL) Low Velocity Impact Database are used to investigate the delamination threshold load. The database contains laminate impact test data for graphite/epoxy (AS4/3501-6), graphite/PEEK (AS4/APC-2), and graphite/BMI (IM7/5260) material systems. The delamination threshold load observations are compared to C-scan damage measurements of impacted specimens to determine if the sudden load drop corresponds to delamination development.