Electric Potential CT Method Research Articles

904 複数のピエソフィルムを用いた受動型電気ポテンシャルCT法による欠陥同定

著者らは,欠陥を同定する手法として,受動型電気ポテンシャルCT法と能動型パルスエコー法を提案し,その有効性を示してきた.本研究では,ピエソフイルム上に受動的に表れる電気ポテンシャル分布から欠陥を同定する受動型電気ポテンシャルCT法において,複数のピエゾフイルムを用いることの効果を調べた.その結果,ピエソフイルムを貼付した表面に対して比較的大きな角度をもつ欠陥に対しては,両面のフイルム上のポテンシャル分布を使用した方が精度よい推定を行うことができることがわかった.

823 受動型電気ポテンシャルCT法を用いた非貫通三次元き裂の同定(GS-3 き裂検出,固定)

823 受動型電気ポテンシャルCT法を用いた非貫通三次元き裂の同定(GS-3 き裂検出,固定)

OS0312 スマートレイヤを用いた超音波パルス反射法による垂直き裂の同定(OS3-3 AE・超音波・赤外線,OS-3 非破壊評価と構造モニタリング1)

The present another proposed the passive electric potential CT method and the supersonic wave pulse echo method using smart layer for detecting and monitoring defects and cracks. The passive electric potential CT method uses a piezoelectric film in the smart layer as a strain sensor. The supersonic pulse reflection method uses the piezoelectric film as a supersonic wave transducer. In the present study the supersonic wave multiple electrodes pulse echo method emitting and receiving pulse echo on electrodes placed on the piezoelectric film is proposed. The applicability of the method to the identification of vertical cracks was experimentally examined. From the time-of-flight of pulse echo emitted from an electrode and received on another electrode an oval is drawn, which is tangential to crack surface. It was found that the obtained ovals intersected at several points. The positions of the intersection agreed well with those of crack tips, indicating the effectiveness of the present method.

Multi-electrodes active and passive electric potential CT methods for crack identification using a smart layer

The present authors proposed the passive electric potential CT method using an electric potential distribution appear- ing due to the direct piezoelectric effect on a piezoelectric film pasted on a structure subjected to mechanical load. By applying an electric pulse on the film for emitting pulse-echo due to the inverse piezoelectric effect, the active pulse-echo method was proposed. In this paper a simultaneous application of the passive and the active methods using the piezoelectric film with multi- electrodes was made for the quantitative identification of through-cracks. The electric potential was measured on the film of a cracked specimen subjected to a varying load. The electric pulse was applied to an electrode on the piezoelectric film and reflection waves were received at several electrodes on the piezoelectric film. Inverse analysis was made to identify the cracks from the observed electric potential distributions and the reflected waves. It was found that the active/passive method was useful for the estimation of the crack depth, for which the passive method was not efficient. The effectiveness of the active/passive method was shown.

OS1308 ピエゾフィルムを用いた受動型/能動型電気ポテンシャルCT法による欠陥モニタリング(非破壊評価と構造モニタリング,オーガナイズドセッション)

OS1308 ピエゾフィルムを用いた受動型/能動型電気ポテンシャルCT法による欠陥モニタリング(非破壊評価と構造モニタリング,オーガナイズドセッション)

821 ピエゾフィルムを用いた受動型/能動型電気ポテンシャルCT法による欠陥モニタリング手法(GS-3 計測・検査(2))

821 ピエゾフィルムを用いた受動型/能動型電気ポテンシャルCT法による欠陥モニタリング手法(GS-3 計測・検査(2))

OS1309 圧電フィルムを用いた超音波による欠陥検出・同定および構造ヘルスモニタリング手法(非破壊評価と構造モニタリング,オーガナイズドセッション)

The passive and active electric potential CT method was proposed by using piezoelectric film for identification of cracks and defects. This method is based on the principle of mutual conversion between mechanical strains and electric potential of piezoelectric material. A smart-layer was constructed using the piezoelectric film, and attached on a structure with a defect In the passive method, the piezoelectric film is used as a sensor of strain distribution. When the structure was subjected to a mechanical load, the electric potential distribution appeared passively on the piezoelectric film due to the direct piezoelectric effect The defect can be identified from the distribution with the help of inverse analysis. It was found that the crack could be identified reasonably, although the defect depth was not well estimated for the defects located far from the layer. In the active method, the piezoelectric film is used as an ultrasonic wave transducer. When the electric signal was input to the smart-layer, acoustic wave was actively emitted from the layer due to the inverse piezoelectric effect, and a reflected wave was received on the layer. This method is useful for the identification of defects far from the layer. In this study, the applicability of the active method was examined. It was found that vertical crack, parallel crack, slant crack and multiple cracks could be estimated well.

Use of the piezoelectric film for the determination of cracks and defects – the passive and active electric potential CT method

The passive and active electric potential CT method was proposed by using piezoelectric film for identification of cracks and defects. This method is based on the principle of mutual conversion between mechanical strains and electric potential of piezoelectric material. A smart-layer was constructed using the piezoelectric film, and attached on a structure with a defect. When the structure was subjected to a mechanical load, the electric potential distribution appeared passively on the piezoelectric film due to the direct piezoelectric effect. The defect can be identified from the distribution with the help of inverse analysis. It was found that the crack could be identified reasonably, although the defect depth was not well estimated for the defects located far from the layer. When the electric signal was input to the smart-layer, acoustic wave was actively emitted from the layer due to the inverse piezoelectric effect, and a reflected wave was received on the layer. It was found that the depth of the defect could be estimated well. The simultaneous use of the passive method and the active method is promising for the identification of the defect.

1207 複合材料中の複合欠陥の同定に対する受動型電気ポテンシャルCT法の適用(J01-2 逆問題解析手法の開発と最新応用(2),J01 逆問題解析手法の開発と最新応用)

1207 複合材料中の複合欠陥の同定に対する受動型電気ポテンシャルCT法の適用(J01-2 逆問題解析手法の開発と最新応用(2),J01 逆問題解析手法の開発と最新応用)

213 受動型および能動型電気ポテンシャルCT法による欠陥同定に関する検討(GS-1 逆問題,乱流)

213 受動型および能動型電気ポテンシャルCT法による欠陥同定に関する検討(GS-1 逆問題,乱流)

Experimental Study on Applicability of Passive Electric Potential CT Method for Identification of Three-Dimensional Surface Crack

Experimental Study on Applicability of Passive Electric Potential CT Method for Identification of Three-Dimensional Surface Crack

2103 複合材料内の2個のはく離に対する受動型電気ポテンシャルCT法の適用性に関する検討(J02-1 逆問題解析手法の開発と最新応用(1),J02 逆問題解析手法の開発と最新応用)

2103 複合材料内の2個のはく離に対する受動型電気ポテンシャルCT法の適用性に関する検討(J02-1 逆問題解析手法の開発と最新応用(1),J02 逆問題解析手法の開発と最新応用)

Passive Electric Potential CT Method Using Piezoelectric Material for Identification of Plural Cracks

Passive Electric Potential CT Method Using Piezoelectric Material for Identification of Plural Cracks

314 受動型電気ポテンシャルCT法による複数き裂の同定に関する実験的検討(OS-3C,OS-3 逆問題解析手法の開発と最新応用)

314 受動型電気ポテンシャルCT法による複数き裂の同定に関する実験的検討(OS-3C,OS-3 逆問題解析手法の開発と最新応用)

受動型電気ポテンシャルCT法による複合材内はく離状欠陥の同定およびモニタリング

受動型電気ポテンシャルCT法による複合材内はく離状欠陥の同定およびモニタリング

複合材中のはく離欠陥に対する受動型電気ポテンシャルCT法の適用性に関する実験的検討(OS1-3 はく離モニタリング,OS1 構造ヘルスモニタリング)

複合材中のはく離欠陥に対する受動型電気ポテンシャルCT法の適用性に関する実験的検討(OS1-3 はく離モニタリング,OS1 構造ヘルスモニタリング)

An Experimental Study on Applicability of Passive Electric Potential CT Method to Crack Identification

An Experimental Study on Applicability of Passive Electric Potential CT Method to Crack Identification

受動型電気ポテンシャルCT法による長さの異なる複数き裂の同定(OS4a 逆問題解析手法の開発と最新応用)

受動型電気ポテンシャルCT法による長さの異なる複数き裂の同定(OS4a 逆問題解析手法の開発と最新応用)

OS09W0285 An experimental study on applicability of passive electric potential CT method to crack identification

OS09W0285 An experimental study on applicability of passive electric potential CT method to crack identification

727 受動型電気ポテンシャル CT 法による複数き裂の同定とその破壊力学的評価

727 受動型電気ポテンシャル CT 法による複数き裂の同定とその破壊力学的評価