Detection and Verification for Delamination of Active Fiber Composites
2010
Hochschulschrift
Zugriff:
98
This dissertation presents a novel method to monitor the bonding condition of active fiber composites (AFCs), which are formed with unidirectionally aligned piezoelectric fibers embedded in epoxy matrix and sandwiched between two symmetrical interdigital electrodes. Because of their mechanical flexibility and toughness, AFCs can be tailored to fit smoothly with curved shell structures and used as integrated sensors/actuators to compose functional structures. Delamination between AFC patch and host structure should be avoided and surveyed through its service life. AFC excited by sinusoidal voltage works like a resonator. Its electric charge is proportional to the strain field experienced by the host material integrated over its coverage area. The electric impedance and mechanical displacement of the AFC patch adhered on an aluminum plate were investigated in a broad frequency range. The modal characteristics depend on the size and shape of delamination. Three kinds of delaminations, including front edge, side edge and corner edge delaminations, were explored and discussed in this dissertation. Analytical solution, finite element simulation, impedance measurement and verification of in-plane vibration using electronic speckle pattern interferometry were presented to show the method for detection of active fiber composites is simple and reliable. Further, the frequency ratio of the second to the fundamental resonance of in-plane vibration plays a significant role to determine the orientation of corner edge delamination.
Titel: |
Detection and Verification for Delamination of Active Fiber Composites
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Autor/in / Beteiligte Person: | Wang, Dwo-Wen ; 王多聞 |
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Veröffentlichung: | 2010 |
Medientyp: | Hochschulschrift |
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