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)

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  • OS0312 Identification of Vertical Cracks by the Supersonic Pulse Echo Method Using Smart Layer

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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.

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