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Effect of electric fields on fracture behavior of ferroelectric ceramics |
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| Authors: | HG Beom SN Atluri |
| Institution: | a Department of Mechanical Engineering, College of Engineering, Chonnam National University, 300 Yongbong-dong, Kwangju 500-757, South Korea b Center for Aerospace Research & Education, School of Engineering and Applied Science, University of California at Los Angeles, 7704 Boelter Hall, Los Angeles, CA 90095-1600, USA |
| Abstract: | The asymptotic problem of a semi-infinite crack perpendicular to the poling direction in a ferroelectric ceramic subjected to combined electric and mechanical loading is analyzed to investigate effect of electric fields on fracture behavior. Electromechanical coupling induced by the piezoelectric effect is neglected in this paper. The shape and size of the switching zone is shown to depend strongly on the relative magnitude between the applied electric field and stress field as well as on the ratio of the coercive electric field to the yield electric field. A universal relation between the crack tip stress intensity factor and the applied intensity factors of stress and electric field under small-scale conditions is obtained from the solution of the switching zone. It is found that the ratio of the coercive electric field to the yield electric field plays a significant role in determining the enhancement or reduction of the crack tip stress intensity factor. The fracture toughness variation of ferroelectrics under combined electric and mechanical loading is also discussed. |
| Keywords: | A fracture B crack mechanics ferroelectrics C asymptotic analysis domain switching |
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