Scattering of impact wave by a crack in composite plateThe 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.
Document ID
19910054235
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ju, T. H. (Colorado Univ. Boulder, CO, United States)
Datta, S. K. (Colorado, University Boulder, United States)
Shah, A. H. (Manitoba, University Winnipeg, Canada)