A New Mixed Mode I/II Fracture Criterion for Arbitrary Cracks in Orthotropic Materials Considering Fracture Process Zone Effects

In this paper, a new mixed mode I/II fracture criterion for orthotropic materials is presented based on the development of the minimum strain energy density concept and considering the absorbed energy in the fracture process zone (FPZ). It is assumed that the arbitrary crack can be in any orientation relative to the fibers. The concept of reinforcement isotropic solid is used to describe the stress state at the crack tip in orthotropic materials. T-stress effects have also been included due to the crack's non-zero orientation to the fibers. To evaluate the accuracy of the criterion, the fracture limit curves for different crack-fiber angles are compared with available experimental data. The good agreement with experimental data compared to other existing criteria demonstrates the superiority of the new proposed criterion.

کلیدواژه ها:

Mixed-mode I/II fracture criterion ، Orthotropic materials ، Arbitrary crack ، Fracture process zone ، Minimum strain energy density