An Improved Cohesive Zone Model for Interface Mixed-Mode Fractures of Railway Slab Tracks

The interface crack of a slab track is fracture mixed-mode that experiences complex loading–unloading–reloading process. A reasonable simulation the interaction between layers tracks key to studying crack. However, existing models disease have problems, such as stress oscillation tip and self-repairing, which do not simulate mixed mode cracks accurately. Aiming at these shortcomings, we propose an improved cohesive zone model combined with unloading/reloading relationship based on original Park–Paulino–Roesler (PPR) in this paper. It shown guaranteed consistency constitutive described better. This conclusion assessment work-of-separation bending test. Through test loading, unloading, reloading, observed effectively eliminated issue self-repairing preserved all essential features. proposed provides tool for study cracking mechanism ballastless theoretical guidance monitoring, maintenance, repair layer defects, interfacial arches.