A strain-rate cohesive fracture model of rocks based on Lennard-Jones potential

To characterize the dynamic mechanical response of rocks during initiation and propagation cracks at a high strain rate, strain-rate cohesive fracture model is established based on Lennard-Jones potential multi-scale rocks. The newly proposed explains micro-mechanism rate effect from molecular scale establishes energy function force function. First, it that arises due to change microscopic properties molecules rate. Thereafter, corresponding tensile shear processes are established. Finally, accuracy verified through numerical simulations. results indicate can accurately simulate failure different rates. strength, compressive obtained by simulations laboratory tests similar.