Interaction of Electric Charges in a Piezoelectric With Rigid External Cracks
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摘要: 利用Stroh方法,研究了含双边固定导电裂纹的二维压电体在广义线力作用下的Green函数.首先分析的是因压电性和边界极化电荷所引起的作用在自由电荷上的Coulomb力.然后,再分析了双边裂纹附近的两个奇异点之间的相互作用问题(其中,至少一个奇异点处存在自由电荷).数值计算表明:当两个或多个奇点互相靠近且奇点中至少存在一个自由电荷时,Coulomb力将明显影响压电介质内的力电场,这时的Coulomb力将不能再被忽略掉.所得结果不仅适用于平面和反平面问题,也适用于面内变形与面外变形相耦合的情况.Abstract: Using Stroh's formalism simple explicit expressions of Green's functions for a 2D piezoelectric body with two semi-infinite fixed conductor cracks subjected to a generalized line force were given. The Coulomb force acting on the free line charge due to the piezoelectricity and the distributed bo undary polarization charges was discussed at first. Interactions between two singularities with free charge (s) located in aregion with external cracks were studied, too. The numerical results show that the Coulomb force for two or more singularities with one free charge at least will have much influence on the electr omechanical fields in piezoelectric media when these singularities move closely with each other and therefore cannot be over looked again. The solutions obtained are valid not only for plane and anti-plane problems but also for coupled problems between in-plane and out-of-plane deformations.
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Key words:
- external crack /
- intensity factor /
- Green’s function /
- Coulomb force
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