十字圧電接合体の特異場の特性

（外部領域への影響）

抄録

Singular stress and electric displacement fields occur at the vertex of interface in piezoelectric joints under an external loading. It can be expected that concentrated electric displacements causes large electric fields in an adjacent space and electric potential will be induced on the surface of electrode when the electrode approaches to the electric field. In the present paper, characteristics in electric field and electric displacement field near a singular point which locates at the vertex in a cross piezoelectric joint are investigated using a commercial program coupling displacement and electric potential. In the model for analysis, the cross piezoelectric joint is formed by joining four blocks of piezoelectric material using epoxy resin. A compressive stress of 1MPa in the x-direction is applied to a side surface of the joint. Distributions of electric filed and electric displacement field near the vertex follow a power law of the distance from the singular point. In particular, distributions for electric filed and electric displacement field near the vertex in the joint and in air have singularity. When the thickness of adhesive layer increase, the strength of the singular field is larger. This can be said for the distributions in air. Distributions of electric field and electric displacement for the distance from the origin locating at the center of adhesive layer in the bottom surface of the joint approach to a constant value as the observation point approaches to the origin.