Premium
Phase field modeling of interface effects on cracks in heterogeneous materials
Author(s) -
Kuhn Charlotte,
Müller Ralf
Publication year - 2019
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201900378
Subject(s) - materials science , fracture (geology) , finite element method , nucleation , phase field models , displacement field , fracture mechanics , phase (matter) , stress field , field (mathematics) , mechanics , displacement (psychology) , composite material , structural engineering , physics , engineering , thermodynamics , mathematics , psychology , quantum mechanics , psychotherapist , pure mathematics
One of the reasons why the phase field approach has become very popular for modeling fracture processes is that therein the entire evolution of fracture follows from energetic principles without the need for different criteria for crack initiation, nucleation, kinking or branching. Furthermore, these models allow for a straightforward numerical implementation with standard finite elements, since displacement jumps and stress singularities are avoided in these models. Consequently, phase field fracture models are now also used to model and simulate fracture of heterogeneous materials such as composites, where cracks may be arrested, deflected or bifurcated at interfaces between the different components of the composite material, resulting in complicated crack patterns. The crack propagation is not only controlled by the elastic and fracture properties of the bulk phases of the material but also by the properties of the interfaces in between. Thus, it is crucial to take these interface properties into account. Therefore in this work, interfaces are equipped with a fracture energy corresponding to the phase field fracture energy of the bulk phases in order to model the interface fracture properties. In the finite element implementation, the interfaces are modeled by means of surface elements without introducing additional degrees of freedom.