Interface fracture of polymer films: blister test experiments and modelling |
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Authors: | ?ukasz Figiel Bernd Lauke |
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Affiliation: | (1) Department of Engineering Science, University of Oxford, Parks Road, 0X1 3PJ Oxford, UK;(2) Leibniz-Institut für Polymerforschung Dresden e.V., 01069 Dresden, Germany |
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Abstract: | The interface fracture between a rigid substrate and polymer film is investigated in this work using pressurised blister test
experiments and modelling. The interface crack growth is studied for two different types of polymer films: stiff and compliant
ones. The pressurised blister test is used to provide critical pressure-crack length curves for different loading media (water
and electrolyte solutions) and loading rates. Two different analytical approaches and a numerical modelling concept are used
to determine the critical total energy release rate as a function of the crack length (crack resistance curve or R-curve).
A relatively flat R-curve is observed for the system with the stiff polymer film, whilst R-curve for the compliant film system
exhibits an increasing tendency. The mixed-mode fracture behaviour occurs for both investigated polymer film systems, as shown
by the value of the mixed-mode angle that is constant for all investigated crack lengths. R-curves are nearly unaffected by
different loading media, whereas the loading rate has a strong influence on the interface fracture of the compliant file system.
Finite element method-based prediction of the total energy release rate is in good agreement with that obtained from analytical
expressions. |
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Keywords: | Adhesion blister test experiment environment interface fracture modelling polymer film |
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