Fracture mechanical concepts for cracks in ferroelectric materials

摘要

Linear fracture mechanics of piezoelectric materials has been investigated rather intensivelyin the last decades.However,most smart ceramics as PZT are polycrystals composed of grainswith ferroelectric domains causing a non-linear electro¬mechanical behavior.At present,non-linear fracture phenomena in ferroelectric materials are a problem of intensive current research.The presentation will attempt to review the state-of-the-art in this growing research field.An introduction is given into the electromechanical field theory of non-linear ferroelectric behavior,mani'sted by the macroscopic polarization- and associated strain-hysteresis.