本文旨在研究楔形體複合壓電材料，內含一裂紋，受到反平面位移及平面電場作用下應力與電位移強度因子問題。此問題之探討，首先引用Liou & Sung（2002）楔形壓電複合材料受一集中螺旋差排之應力與電位移場的結果，對裂紋上的螺旋差排進行積分，在給定施加於裂紋周圍的均佈力與電位移下，建立問題之奇異積分方程式。其次應用數值方法求得此螺旋差排密度之數值解，由螺旋差排密度之數值解進一步求得裂紋尖端處的應力與電位移強度因子。

A crack embedded in two perfectly bonded piezoelectric wedges is analyzed under anti-plane stress and in-plane electric displacement fields applied on the crack faces. Based on the fundamental solutions developed by Liou & Sung（2002） for a screw dislocation interacting with a wedge-shaped piezoelectric bi-material interface, a system of singular integral equations is obtained by distributing the screw dislocation densities on the crack faces. System equation is solved numerically. With the numerically obtained piezoelectric screw dislocation density, the stress and electric displacement intensity factors at the tip of cracks are further computed.

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