Three-dimensional simulation of crack propagation in ferroelectric polycrystals: effect of combined toughening mechanisms
Author (s): Abdollahi, A. and Arias, I.Journal: Acta Materiala
Volume: 65
Pages: 106 - 117
Date: 2014
Abstract:
Ferroelectric ceramics are susceptible to fracture under high electric fields, which are commonly generated in the vicinity of electrodes or conducting layers. In the present work, we extend a phase-field model of fracture in ferroelectric single crystals for the simulation of the propagation of conducting cracks under purely electrical loading. This is done by introducing the electrical enthalpy of a di ffuse conducting layer into the phase-field formulation. Simulation results show an oblique crack propagation and crack branching from a conducting notch, forming a tree-like crack pattern in a ferroelectric sample under positive and negative electric elds. Microstructure evolution indicates the formation of tail-to-tail and head-to-head 90o domains, which results in charge accumulation around the crack. The charge accumulation, in turn, induces a high electric eld and hence a high electrostatic energy further driving the conducting crack. Salient features of the results are compared with experiment
Bibtex:
@article{Abdollahi2014106, title = "Three-dimensional simulation of crack propagation in ferroelectric polycrystals: Effect of combined toughening mechanisms ", journal = "Acta Materialia ", volume = "65", number = "0", pages = "106 - 117", year = "2014", note = "", issn = "1359-6454", doi = "http://dx.doi.org/10.1016/j.actamat.2013.11.016", url = "http://www.sciencedirect.com/science/article/pii/S1359645413008665", author = "Amir Abdollahi and Irene Arias", keywords = "Polycrystals", keywords = "Ferroelectricity", keywords = "Fracture", keywords = "Phase-field models", keywords = "Finite element analysis " }