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When dealing with mixed-mode brittle fracture of cracked elements, T-stress affects both the stress field and the energy balance. This problem is investigated here through the coupled Finite Fracture Mechanics (FFM) criterion by varying mode mixity of the main crack. Results are presented in terms of the critical stress intensity factors (SIF) and the critical kinking angle. As concerns pure mode I loading conditions, if T >0 is large enough, the crack ceases to propagate collinearly and the critical SIF deviates from the fracture toughness of the material. On the other hand, for mode II loading conditions, if T <0 is sufficiently low, the critical SIF ceases to increase and the critical kinking angle jumps to an infinitesimal value

Crack deflection in brittle materials by Finite Fracture Mechanics