Characterization and mechanism of petaling failure under high-velocity impact using plastic state-based peridynamics

Abstract

Petaling failure is one of the most prevalent modes for tubular members exposed to high-velocity impacts. Capturing progressive damage in real-time is crucial for elucidating the trigger mechanism and damage evolution. In this study, a three-dimensional plastic ordinary state-based peridynamics (POSB-PD) was developed to predict the material discontinuity of high-grade X80 steel pipelines under high-velocity impacts. Characteristics of the petaling mode were analyzed quantitatively using cluster analysis and statistical description. The impact processes of petaling formation, including crack propagation, stress triaxiality, bond stretch, and damage number, were systematically discussed. Penetration mechanisms of petaling formation were revealed based on bond breakage and cumulative damage. Intrinsic relationships between mesoscopic defects and macroscopic fractures were established, considering various fracture parameters. A simplified model of energy release rate was established to evaluate the critical fracture condition. These results provided insights into revealing the penetration mechanisms and establishing macro-micro failure linkages for ductile failures in metal structures.