Abstract
A method is presented for estimating the stress intensity factors of interacting cracks in a finite anisotropic medium. The method is based on the simultaneous application of two superposition schemes. In the first scheme, concentrated forces and couples acting at various locations along an imaginary curve within an infinite medium are superposed using the framework of the boundary force method. This transforms the problem of a finite cracked medium to that of an infinite cracked medium. In the second scheme, approximating tractions acting on crack lines are superposed to compute the stress fields required for determining stress intensity factors. It is shown that the computed stress intensity factors of a single crack or several cracks in rectangular specimens agree closely with published data for isotropic specimens. The method is further used to study the dependence of the stress intensity factors on crack statistics, material anisotropy and specimen boundary.
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