Stick‐slip like behavior in shear fracture propagation including the effect of fluid flow

Shear-based fracture propagation in fluid-saturated porous materials is investigated using a displacement–pressure formulation that includes acceleration and inertial effects of the fluid. Pressure-dependent plasticity with nonassociated flow rule adopted to realistically represent stresses bulk material. The domain discretized unequal order T-splines cast into finite element method Bézier extraction. An implicit scheme used for temporal integration. solid acceleration-driven fluid reacts stress waves, but it results pressure oscillations. Adding terms dampens these oscillations increases near tips. By simulating typical shear case, shown stick-slip like, or stepwise, occurs high permeability, also upon mesh refinement. driven build-up tip. Once this region encompasses tip, arrests until has diffused away from crack after which resumed begins anew. This like behavior, large propagation. Stepwise related initial conditions been observed, disappears once length exceeds size influenced by conditions.