Peridynamics-based reformulation of HJC constitutive model for concrete failure analysis under impact

This paper presents a novel bond-based peridynamic model for failure analysis of concrete structures subjected to impact. The model characterizes the tensile response of concrete using the prototype microelastic brittle model, while the Holmquist–Johnson–Cook (HJC) constitutive model is reformulated within the framework of bond-based peridynamics to describe the compressive response. The reformulated model is rate- and pressure-dependent and accounts for strain softening due to plastic damage. A yield criterion for peridynamic bonds is introduced, and the return-mapping algorithm is employed to determine bond-force. A semi-spring contact model is utilized for contact calculation. The validity of the proposed model is verified by comparing simulation results with experimental stress–strain data. Additionally, both low- and high-speed impact tests on concrete structures are simulated. The crack morphology observed in the simulations aligns with experimental observations, indicating that the proposed model can effectively analyze the failure of concrete structures under impact.