2023 年 36 巻 p. 1-8
In this paper, the fracture problem of a piezoelectric actuator consisting of a functionally graded piezoelectric material strip (FGPM strip) with a normal crack and a homogeneous layer by a transient thermal load combined with an electric load is considered. The thermo-electro-mechanical fields in the un-cracked laminate induced by the transient thermal load and the electric load are calculated. By using the superposition technique, the obtained normal stresses are used as the crack surface tractions with opposite sign to formulate the mixed boundary value problem. The integral transform techniques are employed to reduce the problem to the solution of a singular integral equation. We focused on the effect of the crack contact phenomenon on the stress intensity factors for the case of the pure electric load. Moreover, the effect of the difference between two kinds of the electric boundary conditions on the stress intensity factors and the reduction of ones by the electric load would be discussed.