Viscoelastic peridynamic fracture analysis for concrete beam with initial crack under impact. (April 2023)

• Record Type: Journal Article
• Authors: Lu, Dechun; Song, Zhiqiang; Wang, Guosheng; Du, Xiuli
• Is Part Of: Theoretical and applied fracture mechanics. Volume 124(2023)
• Publication Date: 2023-04
• Subjects: Viscoelastic peridynamic method -- Concrete -- Three-point bending beam -- Initial crack -- Dynamic loading; Fracture mechanics -- Periodicals; 620.1126
• DOI: 10.1016/j.tafmec.2023.103757
• Languages: English
• ISSNs: 0167-8442

Abstract

Highlights: The viscoelastic peridynamic method is applied to simulate the impact fracture of the concrete beam. The strain rate evolution law of the concrete beam during loading is visualized intuitively. The cracking mechanism of the concrete beam with initial crack is revealed. The coupling influence law of impact velocity and initial crack on the fracture mode of the concrete beam is obtained. Abstract: 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.