Conducting crack propagation driven by electric fields in ferroelectric ceramics
Tipo de documentoArtículo
Fecha de publicación2013-11
Condiciones de accesoAcceso restringido por política de la editorial
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 to the simulation of the propagation of conducting cracks under purely electrical loading. This is done by introducing the electrical enthalpy of a diffuse conducting layer into the phase-field formulation. Simulation results show 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 fields. Microstructure evolution indicates the formation of tail-to-tail and head-to-head 90° domains, which results in charge accumulation around the crack. The charge accumulation, in turn, induces a high electric field and hence a high electrostatic energy, further driving the conducting crack. Salient features of the results are compared with experiments.
CitaciónAbdollahi, A.; Arias, I. Conducting crack propagation driven by electric fields in ferroelectric ceramics. "Acta materialia", Novembre 2013, vol. 61, núm. 19, p. 7087-7097.
Versión del editorhttp://www.sciencedirect.com/science/article/pii/S1359645413005703
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