Ductile fracture modeling using the modified Mohr-Coulomb model coupled with a softening law for an ASTM A285 steel

Ductile fracture is one relevant failure mechanism in pressurized metallic components such as pressure vessels and pipelines. This work describes a framework to model ductile fracture based on phenomenological critical local strain criterion coupled with softening law rule to predict the onset of ductile fracture and tearing response in typical geometries extracted from an ASTM A285 steel. Overall, the numerical predicted load vs. displacement curves are in good agreement with measured data for all samples. Detailed numerical analyses are also performed to investigate the strain capacity of defected pipes under internal pressure and axial loading.

Automated summary

This work presents a framework for modeling ductile fracture and successfully predicts the onset of fracture and tearing response in pressurized metallic components. The numerical predictions are in good agreement with measured data, and detailed analyses of the strain capacity of defected pipes are performed.