III.2.2 Orientation of micro-crack around itself
The orientation of microcrack around itself generates constraints, displacements, strain energy and consequently influence on the propagation of the crack [3]. In this case, one maintains the orientation angle of microcrack around semi-infinite crack and varies the orientation of this microcrack around itself, the Figures13 to16 show the variation of the strain energy as a function of the orientation angle of the microcrack around itself.