Stress Intensity Factors K_I and K_II for Y-Shaped Cracks at Parallel Pore Channels

Abstract

Mode I and mode II stress intensity factors (SIFs) are determined for material containing parallel power channels with cross-sections as Y-shaped cracks centered at the nodes of regular hexagonal networks and having arms aligned with the links of the network. Calculations are performed for an elementary cell of the material, which includes halves of two adjacent pore channels with any size ratio of the arms. The finite-element method is used. The influence of the fiber cross-sectional radius of curvature on SIFs is shown for equal-arm Y-shaped pore channels. The size range of periodic equal-arm cracks is determined, over which they can be considered as noninteracting ones.