Abstract
ABSTRACT In this work, a phase field approach to modelling fracture in asphalt mixtures is presented. More specifically, a cohesive zone-based phase field model is used. The crack in the material is modelled as a regularised damage, smeared over a region of finite length, using a damage phase field variable. The damage variable takes on the value of 1 for a fully damaged surface to 0 for an intact solid. The energy dissipated due to inelastic behaviour in the damage zone is modelled using a cohesive zone concept and the associated traction-separation constitutive law. The model is implemented in a finite element framework. Several numerical examples are presented to show the performance of the model in simulating fracture in asphalt mixtures at low temperatures. Fracture under mode-I, mode-II and mixed mode is simulated. The numerical results of crack initiation and propagation agrees well with experimental observations.
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