Researches on Crack Propagation of the Two Filled Noncoalescent Coplanar Flaws under the High Strain Rate Loading by means of AUTODYN-Based Simulation

Abstract

To study the influence of fillings on rock failure. By turning to the Drucker-Prager strength model and cumulative damage criteria, investigations are made, with the nonlinear AUTODYN software, into crack propagation behaviors in crack-filled and unfilled specimens under uniaxial dynamic loading. Under investigations are crack initiation position, sequence and angle, and coalescence mode. According to the mode of propagation and coalescence, cracks are divided into three types, i.e., the tensile wing, the antiwing, and the horsetail. The simulation results show that under uniaxial dynamic loading, differences are found in initiation position, angle, and coalescence mode for specimens with cracks filled or otherwise. However, filling does not affect crack initiation sequence. Under the same loading, the damage to filled specimen is less severe than that to the unfilled specimen.

Numerical simulations of fatigue failure processes in intermittent jointed rock masses under the action of repeated stress waves

“…The state equation belongs to a problem of small deformation dynamics because the stress wave amplitude in the simulation is small. Therefore, the state equation of the jointed rock mass can be described by the linear state equation (Zhao et al, 2020):…”

“…Recently, numerical software, such as UDEC (Pan et al, 2021;Li et al, 2022), PFC (Wang X et al, 2020;Yuan et al, 2022), and Autodyn (Li and Wong 2014;Zhao et al, 2020;Zou et al, 2022), were extensively compared as methods to simulate the crack…”