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Modelling cyclic moisture uptake in an epoxy adhesive

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journal contribution
posted on 03.04.2012, 12:54 by Aamir Mubashar, Ian A. Ashcroft, Gary CritchlowGary Critchlow, A.D. Crocombe
This paper presents a methodology for predicting moisture concentration in an epoxy adhesive under cyclic moisture absorption-desorption conditions. The diffusion characteristics of the adhesive were determined by gravimetric experiments under cyclic moisture conditions and the dependence of diffusion coefficient and saturated mass uptake on moisture history was determined. Non-Fickian moisture absorption was observed during absorption cycles while moisture desorption remained Fickian. The diffusion coefficient and saturated moisture content showed variation with absorption-desorption cycling. A finite element-based methodology incorporating moisture history was developed to predict the cyclic moisture concentration. A comparison is made between the new modelling methodology and a similar method that neglects the moisture history dependence. It was seen that the concentration predictions based on non-history dependent diffusion characteristics resulted in over-prediction of the moisture concentration in cyclic conditioning of adhesive joints. The proposed method serves as the first step in the formulation of a general methodology to predict the moisture dependent degradation and failure in adhesives.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Citation

MUBASHAR, A. ... et al., 2009. Modelling cyclic moisture uptake in an epoxy adhesive. Journal of Adhesion, 85 (10), pp. 711 - 735

Publisher

© Taylor and Francis

Version

AM (Accepted Manuscript)

Publication date

2009

Notes

This article was published in the serial, Journal of Adhesion [© Taylor and Francis]. The definitive version is available at: http://dx.doi.org/10.1080/00218460902997224

ISSN

0021-8464;1545-5823

Language

en