DAMAGE IDENTIFICATION OF SMART COMPOSITE STRUCTURES USlNG PlEZOELECTRlC ACTUATORS AND SENSORS

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In the present research, we have developed a damage identification method based on the dynamic responses for smart composite structures with piezoelectric actuators and sensors, in order to improve the reliability and safety of composite structures. The conclusions obtained by the present study are summarized as follows:1. We proposed a method to identity the location and extent of dela, ination in smart composite structures wih plezoelectric sensors, using the dynamic responses in the time domain or frequency domain. (Paper No.1)2. We proposed a vibration control method of smart composite structures using piezoelectric actuators and sensors in order to avoid the damage growth. (Paper No.2)3. In the laminated composite structures with a delamination, we clarified the effect of a delamination on the natural vibration frequencies and vibration modes, and also proposed the damage identification method using piezoelectric sensors. (Paper No.3)4. Main damage modes in composite structures under impact force are matrix cracking and delemination. We analyzed damage growth using the finite element analysis, nad developed an analytical method to predict the complicated damage extension in composite structures. (Paper No.4 & 5)5. We developed a construction method of modal sensors to pick up the specified modal displacement. Using the optimal placement of several sensors, the effective model sensors was constructed. (Paper No.6)