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  • 1
    facet.materialart.
    Unknown
    Scattering of impact wave by a crack in composite plate (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The surface responses due to impact load on an infinite uniaxial graphite/epoxy plate with and without delamination cracks are investigated both in time and frequency domain by using a hybrid method combining the finite element discretization of the near-field with boundary integral representation of the field outside a contour enclosing completely the crack. This combined method leads to a set of linear unsymmetric complex matrix equations which are solved to obtain the response in the frequency domain by biconjugate gradient method. The time domain response is then obtained by using an FFT. In order to capture the time-domain characteristics accurately, high order finite elements have been used. Also, both the six node singular elements and eight node transition elements are used around the crack tips to model the crack-tip singularity. It is shown that from the numerical results for surface responses both depth and length of this crack can be identified.
    Keywords: COMPOSITE MATERIALS
    Type: ASME Winter Annual Meeting; Nov 25, 1990 - Nov 30, 1990; Dallas, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Layering, interface and edge effects in multi-layered composite medium (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Guided waves in a cross-ply laminated plate are studied. Because of the complexity of the exact dispersion equation that governs the wave propagation in a multi-layered fiber-reinforced plate, a stiffness method that can be applied to any number of layers is presented. It is shown that, for a sufficiently large number of layers, the plate can be modeled as a homogeneous anisotropic plate. Also studied is the reflection of guided waves from the edge of a multilayered plate. These results are quite different than in the case of a single homogeneous plate.
    Keywords: COMPOSITE MATERIALS
    Type: Technical Conference of the American Society for Composites; Jun 12, 1990 - Jun 14, 1990; East Lansing, MI; United States
    Format: text
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    NASA TECHNICAL REPORTS
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