Abstract
Dynamic stresses are obtained for an infinite orthotropic medium weakened by two collinear cracks. Time-harmonic elastic waves are interrupted at normal incidence by the line cracks. Fourier transform is applied reducing the problem to solving a pair of dual integral equations. Solution method involves expanding the crack surface displacement in a series of functions that vanish along a collinear line outside the cracks. The unknown coefficients in the series are evaluated by using the Schmidt method. Dynamic stress intensity factors are computed and displayed graphically for an orthotropic medium that corresponds to the elastic properties of boron-epoxy composite.
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