Fracture and fragmentation of dolomite rock using the JH-2 constitutive model: Parameter determination, experiments and simulations

The paper presents a procedure for determining Johnson-Holmquist II (JH-2) model parameters for dolomite rock. The constants were determined based on experiments supplemented with literature data. The parameters responsible for damage and fracture were iteratively obtained based on a proposed drop-weight impact laboratory stand method and numerical simulations. The results demonstrated that some material parameters are dependent on the element dimensions and should be adjusted depending on the problem scale and geometry. In the next step, a numerical blast loading simulation was conducted to analyze the influence of mesh properties. Finally, the JH-2 model for the dolomite rock was verified, and the corresponding parameters were implemented to simulate rock fragmentation. Comparisons with actual tests proved that the model is efficient and accurate for simulating blasting followed by fracture and fragmentation of dolomite rock.