Phase field simulations on the nonlinear fracture of ferroelectric materials

摘要

Ferroelectric material has received considerable attention in industry and academia due to its wide application for actuators,sensors and storage devices.Ferroelectric material often possesses defects,such as notches and voids.It is also brittle and susceptible to cracking at all scales ranging from electric domains to devices.Under mechanical and electrical loadings,the intensified stresses and electric fields in the vicinity of notches or voids may cause polarization switching in ferroelectric materials.Due to the polarization switching,the linear piezoelectric fracture mechanics cannot predict the nonlinear fracture behavior of ferroelectrics under mechanical and electrical loadings.To investigate the polarization switching and the nonlinear behavior of ferroelectrics,a threedimensional phase field model for ferroelectric materials is developed based on the time-dependent Ginzburg–Landau equation (TDGL).