A Gurson model in association with a cohesive zone model on the investigation of cleavage-ductile transition in metals

The rupture in metals can occur by cleavage, where all process is controlled stresses, or ductile fracture, which takes into account the damage caused nucleation and growth of voids.The then dependent on stresses strains. Linear Elastic Fracture Mechanics, widely used engineering practice, based assumption that first prevails, occurs only under certain conditions. Consideration second fracture not so well disseminated. In this work, two methodologies are considered to take cleavage-ductile transition. One Tvergaard-Hutchinson's cohesive model other Gurson- Tvergaard-Needleman's model. considerably different and, initially relationships between models established. Then, conditions for a transition from cleavage determined discussed. Most results presented crack resistence curves obtained material parameters. A strip mode I firstly. It shown that, depending yield stress factors, modes coexist. Also, even when occurring, it affected interactions with voids. Lastly, present simulations compared withCompact Tension experimental results.Results considering coupling better fitting experiments than considered.