Local stress intensity factors along the front of the channel cracks at its intersection with the main crack

Abstract

The intersection of parallel pore channels of the main crack (MC) is considered. The MC was perpendicular to axis of the channel. The channel cross section had the shape ofstarlike three-beam cracks. Angles of the MC front to plane of the channel cracks (CC) were 0, 30, 60 and 90°. The local stress intensity factors (SIF) K_I, К_II, К_III along the CC front which is located at distances of 0.15, 0.08, 0.04, 0.02, 0.012, 0 from the MC front were obtained. It is shown that the maximum local SIF for CC, whose plane is parallel to the MC front, four times higher than the SIF for CC, whose plane is perpendicular to the MC front. The absolute value of the total SIF of shearing and tearing К_ІІ+III = (К₂^II + К₂^III)^1/2 at the CC front has three local maxima: central— at the intersection of the CC front with the MC plane and side peaks near the MC on both sides of its plane.