Abstract
The dynamic stress field around a crack or cracks embedded in an infinite isotropic elastic medium subjected to a SH wave are determined. Based on the qualitatively similar features of crack and dislocation, the stress wave emitted from a vibrating screw dislocation can be regarded as a Green's function. By superimposing an array of dislocation and adjusting the distribution density to fulfill the boundary condition, a singular integral equation with kernels containing Bessel functions is derived, which can be solved by the Galerkin method. Dynamic stress intensity factors, which can be as much as 28 percent higher than the static value, are found to be the same as those results obtained by other investigators. The stress intensity factors of a set of infinite cracks of equal length are also calculated as an application of this method.
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