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Proceedings Paper

SHM system using rectangular versus circular piezoceramic for the inspection within the bond of a composite bonded joint
Author(s): Nicolas Quaegebeur; Philippe Micheau; Patrice Masson; Michel Castaings
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Paper Abstract

A bonded joint between an aluminum plate and CFRP plate (7 plies) is considered using a titanium spar. The bonding is ensured by double sided adhesive that is prone to degradation with aging structures. The problem is to detect the disbond occurring at the CFRP plate/titanium spar interface using guided waves generated by piezoceramic transducers (PZT) bonded on the CFRP plate. The objective of the present work is to optimize the SHM configuration (PZT location, Lamb wave mode, size and shape of the PZT) for pitch and catch measurements within the bond. 1D, 2D and 3D numerical simulations of the instrumented structure were performed to optimize the SHM configuration. It appears that the rectangular shape can ensure a plane wave front within the bond, since the circular shape generates complex wave fronts. For experimental investigation, coupon structure was manufactured with synthetic damages inserted using two hemispherical Teflon tapes between adhesive and titanium spar. The structure was instrumented for inspection within the bond by using rectangular PZT. Experimental validation of propagation characteristics and damage sensitivity are performed using LDV measurement within the bond line. Damage detectability using rectangular piezoceramics in pitch-catch configuration within the bond is validated.

Paper Details

Date Published: 20 April 2012
PDF: 9 pages
Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83481M (20 April 2012); doi: 10.1117/12.915389
Show Author Affiliations
Nicolas Quaegebeur, Univ. de Sherbrooke (Canada)
Philippe Micheau, Univ. de Sherbrooke (Canada)
Patrice Masson, Univ. de Sherbrooke (Canada)
Michel Castaings, I2M, CNRS, Univ. de Bordeaux I (France)

Published in SPIE Proceedings Vol. 8348:
Health Monitoring of Structural and Biological Systems 2012
Tribikram Kundu, Editor(s)

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