受動型電気ポテンシャルCT法を用いた三次元表面き裂の同定に関する実験的検討 [in Japanese] An Experimental Study on Applicability of Passive Electric Potential CT Method to Identification of Three-dimensional Surface Crack [in Japanese]
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This paper examines the applicability of passive electric potential CT (computed tomography) method to the quantitative identification of three-dimensional crack in structures. In this method, piezoelectric film is glued on the surface of structures. Electric potential values on the piezoelectric film change due to the strain distribution on the surface of structures, when the structure is subjected to external load. The strain distribution induces an electric potential distribution on the piezoelectric film. Then, this method does not require electric current application, and passively observed electric potential values on piezoelectric film can be used for the crack identification. The electric potential distribution on piezoelectric film was investigated numerically and experimentally. It was found that the electric potential distribution shows the characteristic change corresponding to the shape of the surface crack. An inverse method based on the least residual method was applied to the crack identification from the electric potential distribution. In this inverse method, square sum of residuals is evaluated between the measured electric potential distributions and those computed from electric potential distribution of the piezoelectric film. Three-dimensional surface crack were identified from measured electric potential distribution. It was found that location and size of the crack can be quantitatively estimated by using two-dimensional distribution of electric potential.
- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 71(707), 1038-1045, 2005-07-25
The Japan Society of Mechanical Engineers