THE IMPACTED DAMAGE STUDY OF A SINGLE CLEAVAGE DRILLED COMPRESSION SPECIMEN BASED ON BOND-BASED PERIDYNAMICS

A dynamic analytical model is built for a single cleavage drilled compression specimen (SCDC) impacted by a split Hopkinson pressure bar based on bond-based peridynamics, in which the Hopkinson bar is simplified as 1D model and the specimen is described as 2D model. The repelling short-range force is used for modeling the impact process. The dynamic failure behaviors of the single cleavage drilled compression specimen are studied using the model. The force analysis indicates that: the stress distribution on the end faces of the specimen is showed as a V-shape pattern and it well solves the limitation of the end face loading way of the traditional experimental-numerical method. Then the crack propagation processes and failure modes are studied under different impact velocities. It shows that: the numerical model accurately predicts the times of the crack initiation, arrest and the secondary crack initiation. Simultaneously, the crack initiation toughness at the crack tip is calculated according to the algorithm of dynamic stress intensity factor in bond-based peridynamics, which provides a new method for the dynamic fracture toughness analysis of materials.