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Application Of Dielectric Analysis To The Study Of Ageing In Adhesive Bonded Structures

Published online by Cambridge University Press:  10 February 2011

Richard A. Pethrick ,
Sadanand B. Joshi ,
David Hayward ,
Zhi-Cheng Li ,
Steven Halliday ,
William M. Banks ,
Ray Gilmore  and
Lawrence W. Yates
Richard A. Pethrick
Affiliation:
Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, Cathedral Street, Glasgow GI IXL, UK.
Sadanand B. Joshi
Affiliation:
Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, Cathedral Street, Glasgow GI IXL, UK.
David Hayward
Affiliation:
Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, Cathedral Street, Glasgow GI IXL, UK.
Zhi-Cheng Li
Affiliation:
Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, Cathedral Street, Glasgow GI IXL, UK.
Steven Halliday
Affiliation:
Department of Mechanical Engineering, University of Strathclyde, James Weir Building, Montrose Street, Glasgow GI 1XJ, UK.
William M. Banks
Affiliation:
Department of Mechanical Engineering, University of Strathclyde, James Weir Building, Montrose Street, Glasgow GI 1XJ, UK.
Ray Gilmore
Affiliation:
Structural Materials Centre, Defence Research Agency, Farnborough, Hants, UK.
Lawrence W. Yates
Affiliation:
Structural Materials Centre, Defence Research Agency, Farnborough, Hants, UK.
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Abstract

Dielectric techniques have the potential of allowing observation of changes in the dipole mobility within an adhesive joint structure as a result of its exposure to a warm humid environment. Water molecules absorbed by an adhesive resin will exhibit a series of distinct relaxation features, which are characteristic of the environment in which the molecules are located. Hydration of the surface oxide of an aluminium-epoxy joint will produce a distinctive dielectric relaxation at approximately 1 MHz which is quantitatively related to the amount of hydroxide formed. Data on aged adhesive joints indicates that the dielectric technique has potential for the study of the changes occurring within the joints and the technique may be also used for studies of carbon fibre - epoxy - carbon fibre structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 503: Symposium JJ – Nondestructive Characterization of Materials in Aging Systems , 1997 , 69
Copyright
Copyright © Materials Research Society 1998

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References

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