Issue 36

Lj. L. Vulićević et alii, Frattura ed Integrità Strutturale, 36 (2016) 46-54; DOI: 10.3221/IGF-ESIS.36.05 51 through inner side of the wall, and “outer” initial crack remains the same as it was in the beginning of simulation, until 64 th step, when “inner” and “outer” crack become equal, 200 mm long, and it has become complete through-wall crack, Fig. 9. Further crack growth is in axial direction until the final step of 3D simulation, when the crack is 209.42 mm long. Fig. 10 shows 3D chart of “inner” and “outer” crack growing. Figure 7 : Step 1 - crack opening and Von Mises stresses at crack tips. Figure 8 : The 7 th step – crack became through-wall and stresses around the crack.