Discrete element modeling of the process zone shape in mode I fracture at peak load and in post-peak regime

The bonded particle discrete element method is used to study the fracture process zone in three point bending tests of notched beams. Five different specimen sizes and different material ductility are studied. To capture the damaged contacts around the induced macro-crack (fully softened and detached contacts in front of the notch), a contact bond model with softening is implemented. Material ductility is modified by changing the post-peak slope...