Passive Electric Potential CT Method Using Piezoelectric Material for Identification of Plural Cracks
Daiki Shiozawa; Shiro Kubo; Takahide Sakagami and Masaaki Takagi

Source CMES: Computer Modeling in Engineering & Sciences, Vol. 11, No. 1, pp. 27-36, 2006
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Keywords Nondestructive evaluation, Crack identification, Electric potential CT method, Passive nondestructive method, Piezoelectric film, Damage monitoring , Plural cracks, Inverse analysis, Akaike information criterion
Abstract The passive electric potential CT (computed tomography) method using piezoelectric film was applied to the identification of plural through cracks. The use of piezoelectric material made it possible to obtain electric potential field without applying electric current. For identification of cracks an inverse analysis scheme based on the least residual method was applied, in which square sum of residuals is evaluated between the measured electric potential distributions and those computed by using the finite element method. Akaike information criterion (AIC) was used to estimate the number of cracks. Numerical simulations were carried out on the identification of plural cracks and a single crack. The location and size of these cracks were quantitatively estimated by the present method. The number of cracks was correctly estimated, even when the plural cracks were closely located and the measured electric potential distribution was similar to that for a single crack.
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