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Proceedings Paper

Nonlinear self-sensing impedance-based fatigue crack detection under a low-frequency vibration
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Paper Abstract

This paper reports the application of a non-linear impedance technique under a low-frequency vibration to detect structural defects of contact type such as fatigue crack. If the contact-type damage is developed within the structure due to the low-frequency dynamic load, the vibration can cause the fluctuation of structural impedance nonlinearly because of the contact acoustic nonlinearity (CAN). This nonlinear effect can lead to amplitude modulation and phase modulation of the current flow. The nonlinear characteristics of the structural impedance can be extracted by observing coupled electromechanical impedance of a piezoelectric active sensor and a nonlinear wave modulation spectroscopy. For experiment, a low-frequency vibration is applied to a notched coupon at a certain natural frequency by a shaker so that the nonlinear fatigue crack can be formed artificially at the notch tip. Then, the nonlinear features are extracted based on a self-sensing impedance measurement from a host structure under a low-frequency vibration. Damage metric is established based on the nonlinear fluctuation of the impedance due to the CAN.

Paper Details

Date Published: 4 April 2012
PDF: 12 pages
Proc. SPIE 8347, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012, 83471I (4 April 2012); doi: 10.1117/12.915483
Show Author Affiliations
Changgil Lee, Sungkyunkwan Univ. (Korea, Republic of)
Seunghee Park, Sungkyunkwan Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 8347:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012
Andrew L. Gyekenyesi, Editor(s)

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