TOUGHENING OF FERROELECTRICS BY THE OUT-OF-PLANE POLING  

作　　者：杨卫 方菲 

机构地区：[1]DepartmentofEngineeringMechanics,TsinghuaUniversity,Beijing100084,China

出　　处：《Acta Mechanica Sinica》2003年第2期147-153,共7页力学学报（英文版）

摘　　要：Subjected to the prior out-of-plane poling, the ferroelectrics can be toughened considerably. The present paper describes the variation of the stress intensity factor (SIF) by 90° switching in ferroelectrics. The analysis is carried out for the combined mechanical and electrical loading, with simple relations obtained for the case of the purely electrical loading. The out-of-plane poling is found to raise the SIF for the crack initiation, but appreciably reduces the SIF for the crack growth in a steady state. More stable fracture resistance curves can be achieved by the out-of-plane poling. This prediction is supported quantitatively by the testing data of SENB specimens of PZT-5 samples, when the toughening effects of polings in three orthogonal directions are compared.

分 类 号：TM27[一般工业技术—材料科学与工程]