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Non-Destructive Dielectric Assessment of Water Permeation in Composite Structures

Published online by Cambridge University Press:  10 February 2011

P. Boinard ,
E. Boinard ,
R.A. Pethrick ,
W.M. Banks  and
R.L. Crane
P. Boinard
Affiliation:
Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 IXL, UK.
E. Boinard
Affiliation:
Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 IXL, UK.
R.A. Pethrick
Affiliation:
Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 IXL, UK.
W.M. Banks
Affiliation:
Department of Mechanical Engineering, James Weir Building, University of Strathclyde, 75 Montrose Street, Glasgow, G1 1XJ, UK.
R.L. Crane
Affiliation:
Non Destructive Evaluation Branch, Materials Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, OH 45433-7817, USA.
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Abstract

Over the last ten years, the application of high frequency dielectric spectroscopy techniques for the assessment of composite structures has been investigated. Novel approaches to assess non-destructively the evolution during ageing of adhesively bonded carbon fibre reinforced plastic (CFRP) structures and bulk glass fibre reinforced plastic (GRP) structures are presented in this paper and the results are critically assessed.

The applicability and limitations of dielectric measurements, in both frequency and time domain, to the monitoring of water ingress at 30°C and 60°C are examined. The correlation between gravimetric and high frequency dielectric spectroscopy data demonstrates the suitability of the techniques regarding the assessment of water uptake in composites structures and illustrates its potential as a non-destructive evaluation (NDE) technique. The dielectric time domain response (TDR) study of adhesively bonded structures indicates a new way to assess such structures. The approach for frequency domain analysis of bulk GRP using a coaxial probe technique indicates the potential portability of the technique for in-situ measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 591 , 1999 , 105
Copyright
Copyright © Materials Research Society 2000

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References

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