Local stress intensity factors for cracks in a material with parallel channels of various cross-section

Abstract

Changes of local stress intensity factors (SIF) are defined at extending of a flat main crack with rectilinear front, perpendicularly to system of parallel pore channels, with cross-sections forms of: a circle, an equilateral triangle, a triangle with the concave sides of constant curvature and a radiate three-beam starlike crack. It is shown that for materials with starlike cross-sections of channels in absentia of external loadings that are perpendicular to a direction of channels local SIF on fronts main and channel cracks have comparable values.