Three-dimensional numerical analysis of stress intensity factors at the intersection of a crack and pore channels with star-like cross-section

The three-dimensional numerical analysis of stress intensity factors (SIF) at the intersection of a main crack (MC) and pore channels has been performed. Each channel consists of three channel cracks (CC) united by their mouths on the channel axis. It has been shown that the rupture of the MC face by the differently oriented CC gives rise to the local SIF at the MC front that is differs more than twice from the mean SIF. The maximum local SIF for the CC the plane of which is parallel to the MC front is four times higher than the SIF for the CC the plane of which is perpendicular to the MC front. The total shearing and tearing mode SIF at the CC front has three local maxima. One maximum is located at the intersection of the CC front with a plane, to which the MC face belongs. Additional peaks are located at some distance from both sides of this plane.