Abstract
Piezoelectric film is a dynamic material that develops an electrical charge proportional to a change in mechanical stress. When the mezoelectric film is attached on the surface of a cracked material under mechanical varying load, the change in distribution of electric potential is observed. Based on this phenomenon, the passive electric potential CT (computed tomography) method was constructed in this study for measuring two- and three-dimensional cracks. For the identification of cracks, the least residual method was applied, in which residuals are evaluated between the measured electric potential distributions and finite element-based calculated distributions on the surfaces of piezoelectric film on the material. It was shown that the proposed method was useful for determining the location and size of cracks.
