“…In discussed studies, the solution of problems is presented, which pertain to the crack growth, however, materials, in which the cracks grow, are considered as isotropic bodies, without taking into account their microstructure (Zhoua, M-J, et al, 2014;Li, J., et al, 2014;Ozgur Aslan, Samuel Forest, 2009;Adelzadeh, M., et al, 2008;Khoei, A.R., et al, 2012;Tianqi Wang, Liangyu Li, Xiao Li & Xu Yang, 2009). Figure 6.…”