Numerical Simulation of Brittle Crack Propagation and Arrest in Steels Considering Shear-Lip Formation

摘要

A model for simulating brittle crack propagation and arrest in steelrnplates is presented. The model considers the influence of shear-lipsrnformed on a fracture surface acting as crack closure force and that of arnloss of plane strain condition at a propagating crack-tip with increasingrndynamic stress intensity factor. The latter effect depends not only onrnthe stress intensity factor but also on crack velocity. The model wasrnapplied to temperature-gradient crack arrest tests and ultra-wide duplexrncrack arrest test. The model successfully explained anomalous crackrnarrest toughness under excessively high applied stress in therntemperature gradient tests and crack arrest at stress intensity factor farrnabove crack arrest toughness in the ultra-wide duplex tests.