Numerical Modeling of the fracture behavior in the transition temperature in ferritic steels is a challenging task as both ductile and brittle mechanisms are competing with each other in this region, this leads to a scatter of fracture toughness values in this region. The current study models ductile phenomenon using Rousselier's model while the Beremin's model is used to capture brittle mechanism of fracture. Rousselier's model uses non local damage mechanics approach; this approach has least dependence on the size of mesh and has the ability to simulate very small crack growths which are very typical in the transition regions. FE simulations have been performed on SENB (single edge notched bend) specimens of two sizes to predict the fracture behavior of the material. Simulated results were compared with the experimental results to justify the prediction.

Keywords: Transition temperature, Damage mechanics, Beremin model, Rousselier's model.