ABSTRACT
To understand the tensile fracturing mechanism of rock, the fracture toughness of rock should be defined. We performed 3-point bending tests for 4 types of rocks. Then, the LS-Dyna code was adopted to simulate the 3-point bending tests and the tensile fracturing procedures of rock. The sample rock was modeled using the HJC (Holmquist-Johnson-Cook) rock material model, and the key parameters were selected by sensitivity analysis and then optimized to precisely describe the mechanism. Finally, the suggested material model and the simulation results were validated with the 3-point bending experiment results. The proposed 3 key parameters (e.g. PL, k1, and evol) can successfully describe the tensile fracturing process of rock model.
