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A STUDY OF CRACK CLOSURE IN ELECTRIC-FIELD-INDUCED FATIGUE IN FERROELECTRIC CERAMICS
作者姓名:Zhang  Zhenke  Fang  Daining
作者单位:Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China
基金项目:Project supported by the National Natural Science Foundation of China(No.10025209)
摘    要:Considering the influence of the domain switching near the tip of a crack and apply-ing the idea of multiscale singularity fields in piezoelectric fracture,we have obtained an empiricalcriterion for the crack closure.Based on the domain switching in the electric yield region,referringto Yang's results on the small scale yield model for the electrical fatigue crack,a model of thecrack closure during electric-field-induced fatigue is developed to analyze the crack growth.Interms of the model we have obtained the formula of the rate of the crack growth under cyclicelectric loading.Finally we compare the theoretical predictions with the results given by Cao andEvans experimentally.It should be pointed out that the model proposed is empirical and needsto be verified by more experimental results.


A STUDY OF CRACK CLOSURE IN ELECTRIC-FIELD-INDUCED FATIGUE IN FERROELECTRIC CERAMICS
Zhang Zhenke Fang Daining.A STUDY OF CRACK CLOSURE IN ELECTRIC-FIELD-INDUCED FATIGUE IN FERROELECTRIC CERAMICS[J].Acta Mechanica Solida Sinica,2003,16(1):41-46.
Authors:Zhang Zhenke Fang Daining
Institution:(1) Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China, CN
Abstract:Considering the influence of the domain switching near the tip of a crack and apply- ing the idea of multiscale singularity fields in piezoelectric fracture,we have obtained an empirical criterion for the crack closure.Based on the domain switching in the electric yield region,referring to Yang's results on the small scale yield model for the electrical fatigue crack,a model of the crack closure during electric-field-induced fatigue is developed to analyze the crack growth.In terms of the model we have obtained the formula of the rate of the crack growth under cyclic electric loading.Finally we compare the theoretical predictions with the results given by Cao and Evans experimentally.It should be pointed out that the model proposed is empirical and needs to be verified by more experimental results.
Keywords:electric fatigue  crack closure  domain switching
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