A rate-dependent peridynamic model for concrete under blast loading

Explosion accidents and terrorist attacks seriously threaten the safety of concrete structures. To study the anti-explosion performance of concrete structures, a rate-dependent peridynamic model of concrete suitable for explosive load is established by introducing the strain rate effect of materials into the original peridynamic theoretical framework. In this model, the relationships between the stretch rate and the dynamic critical stretches of concrete are established. In addition, the strainsoftening effect of concrete and different fracture characteristics under tension and compression are considered in the model. To verify the correctness of the proposed model, the dynamic failure of concrete slabs under contact explosion is investigated, and the failure mode and crack propagation path consistent with the experimental results are obtained.