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Proceedings Paper

Impedance-based damage assessment using piezoelectric sensors
Author(s): Mi-Sun Rim; Seung-Jae Yoo; In Lee; Jae-Hoon Song; Jae-Won Yang
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Paper Abstract

Recently structural health monitoring (SHM) systems are being focused because they make it possible to assess the health of structures at real-time in many application fields such as aircraft, aerospace, civil and so on. Piezoelectric materials are widely used for sensors of SHM system to monitor damage of critical parts such as bolted joints. Bolted joints could be loosened by vibration, thermal cycling, shock, corrosion, and they cause serious mechanical failures. In this paper, impedance-based method using piezoelectric sensors was applied for real-time SHM. A steel beam specimen fastened by bolts was tested, and polymer type piezoelectric materials, PVDFs were used for sensors to monitor the condition of bolted joint connections. When structure has some damage, for example loose bolts, the impedance of PVDF sensors showed different tendency with normal structure which has no loose bolts. In the case of loose bolts, impedance values are decreased and admittance values are increased.

Paper Details

Date Published: 13 April 2011
PDF: 7 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79811C (13 April 2011); doi: 10.1117/12.880210
Show Author Affiliations
Mi-Sun Rim, KAIST (Korea, Republic of)
Seung-Jae Yoo, KAIST (Korea, Republic of)
In Lee, KAIST (Korea, Republic of)
Jae-Hoon Song, Korea Aerospace Research Institute (Korea, Republic of)
Jae-Won Yang, Danamsystems Inc. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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