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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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Multi-mode Damage Detection Methods with Piezoelectric Wafer Active Sensors

Lingyu Yu

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA, yu3{at}engr.sc.edu

Victor Giurgiutiu

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

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 nondestructive 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.

This version was published on July 1, 2009

Journal of Intelligent Material Systems and Structures, Vol. 20, No. 11, 1329-1341 (2009)
DOI: 10.1177/1045389X08096665
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