A singular electric flux density field may occur when mechanical compression or electrical load to piezoelectric joints causes a singular electric flux density field is applied in piezoelectric material corners. This means that a large electric displacement occurs arround a singular point. It can be thought that there are many possible applications of this local large electric displacement. Hence, electric singularity characteristics should be investigated to increase the performance of piezoelectric joints. It is known that the intensity of stress singularity reduces with decreasing the thickness of piezoelectric joints; conversely, the intensity of electric singularity increases under a constant external voltage and load. This implies that there is a relationship between electric singularity and stress singularity. In the present paper, the electric singularity on piezoelectric joints is investigated numerically. Usefulness of piezoelectric joints will then be discussed from the results of analysis.
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