Passive electric potential CT method using piezoelectric material for crack identification
Passive electric potential CT method using piezoelectric material for crack identification
复制标题
利用压电材料的被动电位CT法进行裂纹识别
DOI：
10.1080/10682760310001597518
复制
发表时间：
2004
影响因子：
1.3
通讯作者：
T. Sakagami
中科院分区：
文献类型：
--
作者：
D. Shiozawa;S. Kubo;T. Sakagami
当压电薄膜被粘在受机械载荷作用的裂纹材料的表面时，观察到薄膜表面的电位分布的变化。基于这一现象，可以开发出不需要电流来识别裂纹的被动电位CT(CT)方法。该方法可用于开发具有缺陷和缺陷自监测功能的智能结构。对于由电势分布识别裂纹的方法，采用了一种基于最小残差法的逆方法，该方法计算了电势分布的实测值和有限元计算值之间的残差平方和。对穿透厚度横向裂纹的识别进行了数值模拟。结果表明，利用被动电位CT方法可以定量识别裂纹的位置和大小。
When the piezoelectric film is glued on the surface of a cracked material subjected to mechanical load, change in electric potential distribution is observed on the surface of the film. Based on this phenomenon, the passive electric potential CT (computed tomography) method can be developed, which does not require electric current application for identifying cracks. This method may be applied to develop an intelligent structure with a function of self-monitoring of flaws and defects. For the crack identification from electric potential distribution, an inverse method based on the least residual method was applied, in which square sum of residuals are evaluated between the measured electric potential distributions and those computed by using the finite element method. Numerical simulations were carried out on identification of a through-thickness transverse crack. It was found that the location and size of the crack can be quantitatively identified by the proposed passive electric potential CT method.