【摘 要】
：
Effects of the electric inclusion in ferroelectricson the stress and electric field concentration and polarization switching are investigated based on a pha
【机 构】
：
StateKeyLaboratoryofMechanicsandControlofMechanicalStructures,NanjingUniversityofAeronauticsandAstro
【出 处】
：
The 5th Asian Conference on Mechanics of Functional Material
论文部分内容阅读
Effects of the electric inclusion in ferroelectricson the stress and electric field concentration and polarization switching are investigated based on a phase field approach containing the time-dependent Ginzburg-Landau equation.To capture a clear physical picture with the simulation,the crack medium in the electric inclusion is taken into account explicitlyas a crack fluid mediumas water,oil or air in region.The simulations exhibit a macroscopic electric field concentration in the electric inclusion filled with air,and a significant influenceon the domainevolution from the micro perspective,while the electric inclusion filled with water havelittle influence.The numerical calculations indicated that,when the dielectric constant inside the flaw are much smaller than the dielectric constant of the ferroelectric matrix,the electric field inside the crack medium are enhanced much higher than the applied electric loading.The result implies the domain evolution takes place with the minimization of total free energy,which involves the high electric field energy derived from the electric inclusion.Therefore,the crack fluid mediumin ferroelectric plays in importation role inthe effect on the non-uniform distribution of the stress and electric field by pure electric loading.
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