T-stress effects on crack kinking in Finite Fracture Mechanics

Finite Fracture Mechanics (FFM) is a coupled criterion based on the contemporaneous fulfilment of the energy balance and a proper stress requirement. When dealing with mixed-mode brittle fracture of cracked elements, T-stress affects both the conditions. In the present work, the problem is investigated as the mode mixity varies. Results are provided in terms of the critical stress intensity factors and the critical kinking angle, by referring to two different definitions of dimensionless T-stress, depending on which mode (I or II) dominates. This novel approach is validated by a comparison with PMMA experimental data available in the Literature.