Fatigue & Fracture of Engineering Materials & Structures, Год журнала: 2024, Номер unknown

Опубликована: Дек. 9, 2024

ABSTRACT Current research on frost heave‐induced cracking in fractures of rock masses cold regions typically assumes that are fully saturated. However, actual engineering practice, mass often an unsaturated state. Upon freezing, the fracture surfaces subjected to a complex combination gas pressure, freezing and ice friction forces. This study investigates crack initiation mechanisms with asymmetric edge cracks under gas‐ice pressure conditions. Assuming small yield range, we derive calculation formulas for after stress intensity factor, angle, based variable function elastic‐plastic mechanics theory. Additionally, improved phase‐field model is proposed calculating dynamic propagation mixed‐mode I‐II fractures, key parameters analyzed discussed. The results demonstrate that: By comparing analytical solutions numerical calculations, validity verified. During process, will exhibit bifurcation. At higher water saturation levels, shows pattern initial bifurcation followed by subsequent merging.

Язык: Английский