202 Damage detection in composite materials by ultrasonic wave propagation using MFC actuator and FBG sensor

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  • 202 MFCアクチュエータとFBGセンサを用いた超音波伝播による複合材料中の損傷検知(OS6-1 非破壊評価と構造モニタリング,OS6 非破壊評価と構造モニタリング)

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For damage detection in CFRP laminates, health monitoring techniques using ultrasonic waves are effective. Currently, bulk piezo-ceramic elements are used for sending and receiving the ultrasonic waves. Hence the waves are generally narrowband. In this research, the authors developed a new damage detection system that can employ broadband ultrasonic waves in order to obtain more information in received waves. A macro fiber composite (MFC) actuator developed at NASA generates ultrasonic waves and a fiber Bragg grating (FBG) sensor receives the propagated wave. These elements do not have resonance frequency. Through the experiment for an aluminum plate and a CFRP laminate, it was confirmed that this system has the ability to propagate broadband waves.

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