Scattering of an Impact Wave by a Crack in a Composite Plate

[+] Author and Article Information
S. K. Datta, T. H. Ju

Department of Mechanical Engineering, Center for Space Construction, University of Colorado, Boulder, CO 80309-0427

A. H. Shah

Department of Civil Engineering, University of Manitoba, Winnipeg, Canada R3T 2N2, Canada

J. Appl. Mech 59(3), 596-603 (Sep 01, 1992) (8 pages) doi:10.1115/1.2893765 History: Received July 11, 1990; Revised July 03, 1991; Online March 31, 2008


The surface responses due to impact load on an infinite uniaxial graphite/epoxy plate containing a horizontal crack is 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 completely enclosing 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. From the numerical results for surface responses it seems possible to clearly identify both the depth and length of this crack.

Copyright © 1992 by The American Society of Mechanical Engineers
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