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Crack interaction leads to the bifurcation of crack pattern. The pseudo-traction method is used to analyze interaction among cracks. Bifurcation condition of crack growth pattern under dynamic shear stress depends upon the ratios of crack length to spacing ratio, and the crack length to the perpendicular distance between the two adjacent row ratios. Bifurcation of crack growth patters occurs when the above ratios extends critical values. Bifurcation condition for periodic rectangular cracks subjected to dynamic shear stress is analyzed theoretically. The critical parameter is dependent on crack growth velocity and the velocity of a Rayleigh wave. It is shown from numerical result that the critical parameter increases with the velocity of a Rayleigh wave, and decreases with the increase of crack growth velocity.

Bifurcation of crack pattern in two-dimensional periodic rectangular crack arrays under dynamic shear stress