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Proceedings Paper

Passive and active monitoring for defect detection and quantification in composites
Author(s): Neha Chandarana; Constantinos Soutis; Matthieu Gresil
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Paper Abstract

In this work, a composite pipe is subjected to multiple cycles of mechanical loading/unloading in a three point bending configuration. The specimen is instrumented with eight piezoelectric wafer active sensors (PWAS), used as passive receivers of acoustic emission signals during loading. Amplitude-frequency and amplitude-duration analysis of the signals allows detection of different damage mechanisms. Active monitoring is done using PWAS successively as transmitters and receivers of guided waves, in a pitch-catch configuration. Signals are collected for each chosen excitation frequency in the range 200-300 kHz. Scans are recorded between successive loadings of the specimen to assess the state of damage at each stage, and compare against the ‘pristine’ condition. The axisymmetric L(0,2) mode at 230-250 kHz is shown to be attractive for long distance propagation between axially aligned sensors. Cross-comparison of tuning curves obtained from the pristine condition and test data show attenuation in amplitude of the L(0,2) mode, respectively. Based on this, a damage index is proposed.

Paper Details

Date Published: 27 March 2018
PDF: 10 pages
Proc. SPIE 10600, Health Monitoring of Structural and Biological Systems XII, 1060020 (27 March 2018); doi: 10.1117/12.2296513
Show Author Affiliations
Neha Chandarana, The Univ. of Manchester (United Kingdom)
Constantinos Soutis, The Univ. of Manchester (United Kingdom)
Matthieu Gresil, The Univ. of Manchester (United Kingdom)

Published in SPIE Proceedings Vol. 10600:
Health Monitoring of Structural and Biological Systems XII
Tribikram Kundu, Editor(s)

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