The shielding effect of the imperfect interface on a mode III permeable crack in a layered piezoelectric sensor |
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Authors: | Yong-Dong Li Kang Yong Lee |
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Affiliation: | a Department of Mechanical Engineering, Academy of Armored Force Engineering, No. 21, Du Jia Kan, Chang Xin Dian, Beijing 100072, PR China b School of Mechanical Engineering, Yonsei University, Seoul 120-749, Republic of Korea |
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Abstract: | The mechanical model is established for a piezoelectric sensor with a mode III permeable crack parallel to the imperfect interface. Fracture analysis is performed by the standard methods of Fourier transform and singular integral equation. Three conclusions are drawn: (a) the imperfect interface has a shielding effect on the crack parallel and very near to it; (b) the shielding effect depends on the structural stiffness and the distance between the crack and interface; (c) for the electrically permeable crack, mechanical imperfection has more remarkable shielding effect than dielectric imperfection does. |
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Keywords: | Piezoelectric sensor Imperfect interface Permeable crack Shielding effect Stress intensity factor |
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