An Improved Bond-based Peridynamics Model Based on Quasi-brittle Material Mechanics

The bond-based peridynamics model is frequently employed to simulate the deterioration of quasi-brittle materials. Nevertheless, the characteristics of the nonlinear cannot be captured by this model. Therefore, by combining the features of the tensile and compressive stress-strain curves and precisely defining the parameters, an improved constitutive model is proposed. The validity of the model is demonstrated by the fact that the crack propagation mechanism obtained from numerical simulation of a rock sample with a pre-existing flaw is basically consistent with the experimental results and simulation results of previous writers.