Abstract
Experimental and numerical investigations on the plasticity, damage and fracture behavior of a pipeline steel were conducted in this study. Anisotropy effects on the plastic deformation and fracture properties of the material were taken into consideration by performing tests along different loading directions with respect to the rolling direction. Fracture behavior of the steel was characterized through conducting a comprehensive experimental program covering a wide range of stress states by using fracture specimens of various geometries along different loading angles. Besides the fracture experiments in the laboratory scale, the drop weight tear tests of full plate thickness along different loading directions were performed as well. The recently proposed evolving non-associated Hill48 model was adopted to describe the anisotropic hardening behavior of the investigated material. Finite element analysis on the fracture behavior of this material was performed by using a coupled damage mechanics model with triaxiality and Lode angle dependence. Through the hybrid experimental and numerical investigations, the influences of anisotropy on the plastic deformation and fracture behavior of the pipeline steel are analyzed.
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