COMBINED DAMAGE FRACTURE CRITERIA FOR PIEZOELECTRIC CERAMICS

查看全文 作　　者：YangXinhua ChenChuanyao HuYuantai [1]WangCheng

机构地区：[1]DepartmentofMechanics,HuazhongUniversityofScienceandTechnology,Wuhan430074,China

出　　处：《Acta Mechanica Solida Sinica》索引2005年第18卷第1期,共7页

基　　金：Project supported by the National Natural Science Foundation of China(No.10172036)and by the Scientific ResearchFoundation for Returned Overseas Chinese Scholars,State Education Ministry. 摘　　要：Mechanical and electrical damages are introduced to study the fracture mechanics of piezoelectric ceramics in this paper. Two kinds of piezoelectric fracture criteria are established using the method of least squares combined with a damage analysis of the well-known piezoelectric fracture experiments of Park and Sun’s. One is based on a linear combination of the mechanical and electrical damages and the other on their nonlinear combination. When the combined damage D is up to its critical value Dc, piezoelectric fracture occurs. It is found from the qualitative comparison of the numerical results with the experimental data that the nonlinearly combined damage fracture criterion can give a better prediction of piezoelectric fracture. And it is concluded from the nonlinearly combined damage fracture criterion that a negative electric feld impedes fracture whereas the efect of a positive electric feld on fracture depends on its magnitude. 关键词：电力耦合混合损伤断裂标准压电陶瓷

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COMBINED DAMAGE FRACTURE CRITERIA FOR PIEZOELECTRIC CERAMICS

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