Evaluation of defects in composite plates under convective environments using lock-in thermography

Authors
Citation
W. Bai et Bs. Wong, Evaluation of defects in composite plates under convective environments using lock-in thermography, MEAS SCI T, 12(2), 2001, pp. 142-150
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
MEASUREMENT SCIENCE & TECHNOLOGY
ISSN journal
0957-0233 → ACNP
Volume
12
Issue
2
Year of publication
2001
Pages
142 - 150
Database
ISI
SICI code
0957-0233(200102)12:2<142:EODICP>2.0.ZU;2-L
Abstract
Lock-in thermography is a technique which is increasingly being used for th e evaluation of subsurface defects in composite materials such as carbon-fi bre-reinforced polymers (CFRPs) in aircraft structures. Most CFRP structure s have a finite thickness and non-destructive inspection is performed in a natural ambient environment. In this paper, a photothermal model is develop ed in order to investigate the behaviour of thermal waves in homogeneous pl ates and layered plates with finite thicknesses under convective conditions . The model is then utilized to predict the phase differences produced by m ulti-layer subsurface defects and optimum inspection parameters. The theore tical results are compared with the experimental results. The detectivity o f lock-in thermography for CFRP is also presented in this paper.