Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements

R.L. Crane, D. Hayward, B. McConnell, R.A. Pethrick, A.J. Mulholland, S. McKee, C. MacKay

Research output: Contribution to conferencePaper

Abstract

The most significant environmental factor in the degradation of adhesively bonded aluminium joints is moisture ingress. Water degrades the adhesive by plasticisation and hydrolysis, leading to failure with in the adhesive, it hydrates the oxide layer disrupting the adhesive/metal interface leading to interfacial failure. Since water is a polar material dielectric measurements are an effective means of detecting water at low concentrations. Dielectric techniques which use the aluminium adherends as the electrodes are capable of non-destructive measurement within a joint without the use of embedded sensors and if the frequencies employed are high enough (~GHz) then spatial information (~cms) on the water distribution should be available. In addition measurements over a large frequency spectrum can yield information on the interaction of the water within the adhesive, important in deducing the mechanisms by which the water diffuses through the adhesive and the interface.
LanguageEnglish
Publication statusUnpublished - 2005
Event37th ISTC - Seattle, WA
Duration: 31 Oct 20053 Nov 2005

Conference

Conference37th ISTC
CitySeattle, WA
Period31/10/053/11/05

Fingerprint

Adhesives
Aluminum
Water
Hydrates
Hydrolysis
Moisture
Degradation
Electrodes
Oxides
Sensors
Metals

Keywords

  • ahesively bonded aluminium joints

Cite this

Crane, R. L., Hayward, D., McConnell, B., Pethrick, R. A., Mulholland, A. J., McKee, S., & MacKay, C. (2005). Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements. Paper presented at 37th ISTC, Seattle, WA, .
Crane, R.L. ; Hayward, D. ; McConnell, B. ; Pethrick, R.A. ; Mulholland, A.J. ; McKee, S. ; MacKay, C. / Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements. Paper presented at 37th ISTC, Seattle, WA, .
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Crane, RL, Hayward, D, McConnell, B, Pethrick, RA, Mulholland, AJ, McKee, S & MacKay, C 2005, 'Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements' Paper presented at 37th ISTC, Seattle, WA, 31/10/05 - 3/11/05, .

Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements. / Crane, R.L.; Hayward, D.; McConnell, B.; Pethrick, R.A.; Mulholland, A.J.; McKee, S.; MacKay, C.

2005. Paper presented at 37th ISTC, Seattle, WA, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements

AU - Crane, R.L.

AU - Hayward, D.

AU - McConnell, B.

AU - Pethrick, R.A.

AU - Mulholland, A.J.

AU - McKee, S.

AU - MacKay, C.

PY - 2005

Y1 - 2005

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AB - The most significant environmental factor in the degradation of adhesively bonded aluminium joints is moisture ingress. Water degrades the adhesive by plasticisation and hydrolysis, leading to failure with in the adhesive, it hydrates the oxide layer disrupting the adhesive/metal interface leading to interfacial failure. Since water is a polar material dielectric measurements are an effective means of detecting water at low concentrations. Dielectric techniques which use the aluminium adherends as the electrodes are capable of non-destructive measurement within a joint without the use of embedded sensors and if the frequencies employed are high enough (~GHz) then spatial information (~cms) on the water distribution should be available. In addition measurements over a large frequency spectrum can yield information on the interaction of the water within the adhesive, important in deducing the mechanisms by which the water diffuses through the adhesive and the interface.

KW - ahesively bonded aluminium joints

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M3 - Paper

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Crane RL, Hayward D, McConnell B, Pethrick RA, Mulholland AJ, McKee S et al. Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements. 2005. Paper presented at 37th ISTC, Seattle, WA, .