Issue 36

V. Petrova et alii, Frattura ed Integrità Strutturale, 36 (2016) 8-26; DOI: 10.3221/IGF-ESIS.36.02 21 (a) (b) Figure 15 : Stress intensity factors k I and k II as function 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 3 (60° ≤ β ≤ 120°). Three edge cracks with different sizes a 1 =1 and a 2 = a 3 =0.5. (a) (b) Figure 16 : Fracture angles ϕ (1) and 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°), (b) for crack 3 (60° ≤ β ≤ 120°). Three edge cracks with different sizes a 1 =1 and a 2 = a 3 =0.5. (For small angles the figures are similar to the case of two cracks.) (a) (b) Figure 17 : The non-dimensional critical load p cr as function of the inclination angle β=β n for two equal edge cracks for different distances d between the cracks: (a) for 3 cracks (60° ≤ β ≤ 120°), (b) for 3 cracks (60° ≤ β ≤ 120°). Three edge cracks with different sizes a 1 =1 and a 2 = a 3 =0.5.