Estudio de los parámetros materiales de un modelo variacional de fractura dúctil

Abstract

In this work we study the parameters of the variational ductile fracture model of [1], which is characterized for having coupled plasticity and damage gradients in its formulation. Emphasizes is on non-classical material properties, which are used to describe the phenomena taking place beyond the elastic phase. Test are executed on an asymmetric notched geometry, with vertical monotonic loading applied on one of its extremes. As result of this study, we have a deep characterization of the individual and combined effects of the plasticity and damage parameters, standing out a fracture mode predictive mechanism based on the damage threshold ω_0, the control of the damage band width using the internal characteristic length variable η_d. Also, we have descriptions to increase or decrease the plasticity through plasticity parameters, especially with η_p. Furthermore, we include graphics of different material behaviors that can be obtained, from brittle to ductile, capturing Dugdale and Barenblatt responses without the necessity of changing the constitutive functions of the model, that represents an important advantage with respect to other models.