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Journal of Intelligent Material Systems and Structures
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1045389X08096665v1
20/11/1329    most recent
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Article

Multi-mode Damage Detection Methods with Piezoelectric Wafer Active Sensors

Lingyu Yu* and Victor Giurgiutiu

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA

* To whom correspondence should be addressed.


  Abstract

PWAS are small and non-invasive transducers that can be easily affixed to a structure to interrogate it at will. Their wideband non-resonant properties make them advantageous candidates for multiple modes structural health monitoring (SHM) and non-destructive evaluation (NDE) simply by changing the driving frequencies. This paper presents research results obtained by using PWAS transducer for SHM/NDE. The results are given in the following directions: (1) PWAS operation principles; (2) PWAS electromechanical impedance measurements; (3) PWAS ultrasonic SHM/NDE; and (4) PWAS multi-mode corrosion detection. The analytical methods and experimental results can be successfully used in the design of active SHM systems to be embedded on operational structures, such as aircraft panels.

Key Words: PWAS, piezoelectric, multiple modes, impedance, Lamb waves, phased array, damage detection, SHM, NDE

First published on October 16, 2008, doi:10.1177/1045389X08096665

Journal of Intelligent Material Systems and Structures 2009;20:1329.

A more recent version of this article appeared on July 1, 2009

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