Electro-mechanical impedance method for crack detection in metallic plates

Victor Giurgiutiu; Andrei N. Zagrai

doi:10.1117/12.434167

24 July 2001 Electro-mechanical impedance method for crack detection in metallic plates

Victor Giurgiutiu, Andrei N. Zagrai

Proceedings Volume 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring; (2001) https://doi.org/10.1117/12.434167
Event: 6th Annual International Symposium on NDE for Health Monitoring and Diagnostics, 2001, Newport Beach, CA, United States

Abstract

As a nondestructive evaluation technology, the EM impedance method allows us to identify the structural dynamics directly through in-situ active piezoelectric sensors. Previous work performed on 1-D steel beams structures shown through both theoretical analysis and experimental results that E/M impedance (or admittance) spectrum is a direct identifier of structural dynamics. The scope of presented work was to extend the positive results obtained for 1-D structure onto 2-D structures. Experiment analysis of 1-D and2-D structures has shown that E/M impedance (or admittance) spectrum accurately identifies the natural frequency spectrum of the specimens. Theoretical analysis was performed for particular boundary conditions to model the experimental set-up. Experiments were conducted on simple specimens in support of the theoretical investigation, and on thin-gauge aluminum plates to illustrate the method's potential. The number of specimens was sufficient to form a statistical data set. The aging aircraft panel was instrumented with piezoelectric active sensors and the spectrum of natural frequencies was measured at high frequency range. The changing of the spectrum due to presence of local small crack was noticed.

Citation Download Citation

Victor Giurgiutiu and Andrei N. Zagrai "Electro-mechanical impedance method for crack detection in metallic plates", Proc. SPIE 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, (24 July 2001); https://doi.org/10.1117/12.434167

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available