Issue 36

V. Petrova et alii, Frattura ed Integrità Strutturale, 36 (2016) 8-26; DOI: 10.3221/IGF-ESIS.36.02 20 (a) (b) Figure 12 : Stress intensity factors k I and k II as functions of the inclination angle β=β n of the edge cracks to the surface for different distances d between the cracks: (a) for crack 2 (60° ≤ β ≤ 120°) (b) for crack 2 (15° ≤ β ≤ 90°) (SIFs for cracks 1 and 3 are similar as in Figs. 2 a, b for two crack). Three equal edge cracks. (a) (b) Figure 13 : Fracture angles ϕ (2) as functions of the inclination angle β=β n of the edge cracks to the surface for different distances d between the cracks: (a) for crack 2(60° ≤ β ≤ 120°) and (b) for crack 2 (15° ≤ β ≤ 90°). (The fracture angles ϕ for cracks 1 and 3 are similar as in Figs. 3 a, b for two crack.) Three equal edge cracks. (a) (b) Figure 14 : The non-dimensional critical load p cr as function of the inclination angle β=β n for equal edge cracks for different distances d between the cracks: (a) for three cracks (60° ≤ β ≤ 120°), (b) for three cracks (15° ≤ β ≤ 90°).