Effect of electric displacement saturation on the stress intensity factor for a crack in a ferroelectric ceramic |
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| Authors: | K M Jeong I O Kim H G Beom |
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| Institution: | Department of Mechanical Engineering, College of Engineering, Chonnam National University, 300 Yongbong-dong, Kwangju 500-757, South Korea |
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| Abstract: | A crack in a ferroelectric ceramic with perfect saturation under electric loading is analyzed. The boundary of the electric displacement saturation zone ahead of the crack tip is assumed to be ellipse in shape. The shape and size of ferroelectric domain switching zone near a crack tip is determined based on the nonlinear electric theory. The stress intensity factor induced by ferroelectric domain switching under small-scale conditions is numerically obtained as a function of the electric saturation zone parameter and the ratio of the coercive electric field to the yield electric field. It is found that the stress intensity factor increases as the ratio of the semi-axes of the saturation ellipse increases. |
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| Keywords: | Author Keywords: Ferroelectric ceramics Electric saturation zone Domain switching Stress intensity factor |
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