Flexoelectric Fracture-Ratchet Effect in Ferroelectrics

Kumara Cordero-Edwards, Hoda Kianirad, Carlota Canalias, Jordi Sort, Gustau Catalan

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Resum

© 2019 American Physical Society. The propagation front of a crack generates large strain gradients and it is therefore a strong source of gradient-induced polarization (flexoelectricity). Herein, we demonstrate that, in piezoelectric materials, a consequence of flexoelectricity is that crack propagation is helped or hindered depending on whether it is parallel or antiparallel to the piezoelectric polar axis. The discovery of crack propagation asymmetry proves that fracture physics cannot be assumed to be symmetric in polar materials, and indicates that flexoelectricity should be incorporated in any realistic model.
Idioma originalAnglès
Número d’article135502
RevistaPhysical Review Letters
Volum122
DOIs
Estat de la publicacióPublicada - 2 d’abr. 2019

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