A multi-state progressive cohesive law for the prediction of unstable propagation and arrest of Mode-I delamination cracks in composite laminates. (1st May 2021)

• Record Type: Journal Article
• Authors: Zhou, Yuchen; Xiao, Yi; Wu, Qingxin; Xue, Yuande
• Is Part Of: Engineering fracture mechanics. Volume 248(2021)
• Publication Date: 2021-05-01
• Subjects: Stick-slip behavior -- Dynamic crack propagation -- Multi-state progressive cohesive law (MP-CL) -- Finite element analysis -- Double cantilever beam (DCB) test; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2021.107684
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Expression of toughness for crack initiation, propagation and arrest is derived. A multi-state progressive cohesive law for dynamic crack propagation is proposed. A quantitative characterization for unstable stick-slip fracture is conducted. Ratio of initiation toughness to arrest has significant effects on fracture behavior. Abstract: In this paper, a finite element simulation study was performed on the dynamic crack propagation and arrest in double cantilever beam (DCB) specimens with interleaves. The expressions of crack initiation toughness, propagation toughness, arrest toughness, and kinetic energy during unstable crack propagation were theoretically derived based on the energy balance principle. The dynamic fracture toughness parameters were calibrated based on the DCB test results. For the simulations, a multi-state progressive cohesive law (MP-CL) suitable for quasi-static analysis was proposed, and the MP-CL parameters were introduced into the finite element model using the USDFLD subroutine in the ABAQUS software. The unstable crack stick–slip propagation behavior of the DCB specimens was successfully simulated, revealing the complex mechanical characteristics, such as the load–displacement response, kinetic and fracture energy, and crack propagation velocity, during unstable crack propagation. The simulation results were quite consistent with the experimental results, validating the correctness and effectiveness of the proposed model.