Viscoelastic peridynamic fracture analysis for concrete beam with initial crack under impact

Based on viscoelastic peridynamic method, a numerical model of a three-point bending concrete beam with an initial crack is established in this work, whose accuracy and rationality are verified by comparing the fracture modes calculated by this model with the experimental results. The paper analyzed the angle of crack propagation and the evolution of energy, displacement, strain, and strain rate in the beam by the verified numerical model, while a total of 24 numerical examples with different initial crack positions and loading velocities are simulated, based on which the coupling influence law of the initial crack and loading velocity on the fracture mode of the beam is obtained. This paper reveals the dynamic fracture mechanism of the three-point bending concrete beam with an initial crack, and further assesses the features and superiorities of the viscoelastic peridynamic method by the agency of numerical experiments. Thus far, it has been certified that the developed viscoelastic peridynamic mothed can fairly consider the impact of the initial crack and loading velocity on the bearing capacity, deformation, and fracture properties of the concrete structure.

Automated summary

A numerical model of a three-point bending concrete beam with an initial crack is established using the viscoelastic peridynamic method. The model's accuracy and rationality are verified by comparing the fracture modes calculated by this model with experimental results. The paper analyzes the angle of crack propagation and the evolution of energy, displacement, strain, and strain rate in the beam using the verified numerical model. The coupling influence law of the initial crack and loading velocity on the fracture mode of the beam is obtained based on 24 numerical examples with different initial crack positions and loading velocities.