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The interaction of a screw dislocation with an interfacial edge crack in a two-phase piezoelectric medium is investigated.
Closed-form solutions of the elastic and electrical fields induced by the screw dislocation are derived using the conformal
mapping method in conjunction with the image principle. Based on the electroelastic fields derived, the stress and electric
displacement intensity factors, the image force acting on the dislocation are given explicitly. We find that the stress and
electric displacement intensity factors depend on the effective electroelastic material constants. In the case where one of
two phases is purely elastic, the stress intensity factor and image force are plotted to illustrate the influences of electromechanical
coupling effect, the position of the dislocation and the material properties on the interaction mechanism.
The project supported by the Doctoral Foundation of Hebei Province (B2003113) 相似文献
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I.IntroductionDuetotheirintrinsiccouplingeffectbetweenmechanicalandelectricalfields,piezoelectricmaterialshavebeenwidelyusedintechnologyastransducersandsensorsand,morerecently,asactuatorsinsmartstructures.lnordertooptimizetheirmicrostructuresandunderstand… 相似文献
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I.IntroductionItiswell'knownthatoneofthemostpowerfultoolsinlinearfieldtheoriesistheGreen'sfunction.Fore1asticity,considerableresearchcanbefoundintheliterature.However,theGreen'sfunctionforpiezoe1ectricityisratherlimitedduetotheanisotropyandelectromechanic… 相似文献
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本文利用迭加原理,给出了点简支正交各向异性短形薄板弯曲问题的封闭的级数式解答.简支点的位置和横向载荷的分布均可任意.用本文的级数解给出的算例与以往的数值解是十分一致的. 相似文献
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We study the electrically forced thickness-shear and thickness-twist vibrations of stepped thickness piezoelectric plate mesa resonators made of polarized ceramics or 6-ram class crystals. A theoretical analysis based on the theory of piezoelectricity is performed, and an analytical solution is obtained using the trigonometric series. The electrical admittance, resonant frequencies, and mode shapes are calculated, and strong energy trapping of the modes is observed. Their dependence on the geometric parameters of the resonator is also examined. 相似文献
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半平面压电体的Green函数及其应用 总被引:1,自引:0,他引:1
本文研究半平面压电体在线力、电荷和位错作用下的弹性场和电场,即Green函数.基于各向异性弹性力学中的Stroh方法和解析延拓理论,推导了Green函数的封闭形式的解.作为解的应用,分析了含半无限裂纹的无限大压电介质的机电耦合场,给出了应力和电位移强度因子的解析表达式. 相似文献