Analysis of dynamic stress concentration in an infinite body with parallel penny-shaped cracks by BIEM

The approach to determination of the stress-strain stare of an infinite body with parallel time-harmonic loaded cracks is proposed. Using the superposition, the problem is reduced to the system of boundary integral equations with Helmholtz potential singularity, the displacement jumps across the crack faces being the unknown boundary quantities. The numerical solution of constructed boundary integral equations is simplified as far as all derivatives in regular kernels that characterize the dynamic crack interaction are taken. As an example, two cracks of equal radii are considered, normal time-harmonic loading applied to their faces. The influence of dynamic crack interaction on the mixed mode stress intensity factors is studied numerically. Copyright (C) 1996 Elsevier Science Ltd