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Proceedings Paper

Nondestructive technique based on vibration measurements and piezoelectric patches for monitoring corrosion phenomena
Author(s): Ernesto Monaco; Mauro Fontana; Luca De Rosa; Francesco Bellucci; Leonardo Lecce
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Paper Abstract

The paper presents a new application of a NDT based on vibrations measurements which has been developed by the authors and already tested for analyzing damages of many structural elements. The proposed method is based on the acquisition and comparison of Frequency Response Functions (FRFs) of the monitored structure before and after a damage occurred. Structural damages modify the dynamical behavior of the structure and consequently its FRFs making possible to calculate a representative Damage Index. Main target of this work was to test the developed NDT for identifying and analyzing typical corrosive phenomena. A thin aluminium plate, typical for aeronautical employ, was chosen as test-article; an array of piezoelectric patches has been employed for both exciting the test article and acquiring the structural response in many points of it. Both homogeneous and localized corrosion phenomena have been recreated on the plate surface in laboratory environment. Two expressions of Damage Indices were calculated and statistically analyzed. Very small percentages of thickness variations have been detected and localized using the proposed methodology and it has been possible to follow corrosion dynamics (in terms of mass and stiffness variations of the test-article) by monitoring the values of the experimental Damage Indices.

Paper Details

Date Published: 15 July 2002
PDF: 8 pages
Proc. SPIE 4701, Smart Structures and Materials 2002: Smart Structures and Integrated Systems, (15 July 2002); doi: 10.1117/12.474648
Show Author Affiliations
Ernesto Monaco, Univ. degli Studi di Napoli Federico II (Italy)
Mauro Fontana, Univ. degli Studi di Napoli Federico II (Italy)
Luca De Rosa, Univ. degli Studi di Napoli Federico II (Italy)
Francesco Bellucci, Univ. degli Studi di Napoli Federico II (Italy)
Leonardo Lecce, Univ. degli Studi di Napoli Federico II (Italy)


Published in SPIE Proceedings Vol. 4701:
Smart Structures and Materials 2002: Smart Structures and Integrated Systems
L. Porter Davis, Editor(s)

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