Nondestructive technique based on vibration measurements and piezoelectric patches for monitoring corrosion phenomena

Ernesto Monaco; Mauro Fontana; Luca De Rosa; Francesco Bellucci; Leonardo Lecce

doi:10.1117/12.474648

15 July 2002 Nondestructive technique based on vibration measurements and piezoelectric patches for monitoring corrosion phenomena

Ernesto Monaco, Mauro Fontana, Luca De Rosa, Francesco Bellucci, Leonardo Lecce

Author Affiliations +

Proceedings Volume 4701, Smart Structures and Materials 2002: Smart Structures and Integrated Systems; (2002) https://doi.org/10.1117/12.474648
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

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.

Citation Download Citation

Ernesto Monaco, Mauro Fontana, Luca De Rosa, Francesco Bellucci, and Leonardo Lecce "Nondestructive technique based on vibration measurements and piezoelectric patches for monitoring corrosion phenomena", Proc. SPIE 4701, Smart Structures and Materials 2002: Smart Structures and Integrated Systems, (15 July 2002); https://doi.org/10.1117/12.474648

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