Abstract
Keywords: crack propagation, numerical simulation, SHPB experiment, pre-crack Brazilian disc. Abstract. We presented a new two-dimensional crack criterion for DDA (Discontinuous Deformation Analysis) method to simulate the failure of pre-crack Brazilian disc marble specimens under dynamic loading. The Split Hopkinson Pressure Bar (SHPB) equipment was used to impact the specimen and check the applicability and validity of the improved theoretical fracture criteria. The mechanism of crack propagation and the influence of pre-crack on crack process are explored through experiment and numerical simulation. It is concluded that the simulation results reproduce the whole fracture process, i.e., the initiation, propagation and failure of the specimen under dynamic loading condition, agreeing favorably with those results obtained from SHPB tests. The results show that: (1) the pre-crack specimen cracks from pre-crack tips firstly, and then expands to the sides in opposite directions, eventually splitting to two separate parts; (2) the fracture mode of pre-crack rock specimen is tensile failure, and the tensile stress of crack tip is the direct driving force leading to crack propagation.
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