Abstract
ABSTRACTSized glass fibre bundles were treated using atmospheric pressure plasma in a helium/tetrafluoromethane gas mixture. X-ray photoelectron spectroscopy showed that fluorine was introduced onto the sizing surface. A new analysis method (dynamic micro-wetting) to determine the wetting rate of the plasma-treated fibre bundles is presented. The dynamic micro-wetting test using glycerol as a test liquid showed a reduced wetting rate after plasma treatment. It is demonstrated that dynamic micro-wetting is a useful tool for the characterization of fibre bundle wetting.
Highlights
Glass fibre composites are widely used in applications where high stiffness, low weight and low cost are required, for example in ship hulls and wind turbine blades
The current paper investigates the influence of dielectric barrier discharge (DBD) plasma in a He/CF4 mixture on the surface of commercial sized glass fibre with the aim of introducing fluorine on the sizing surface
Circular ’island’ formations with a diameter in the order of 200 nm are recognized in both figs. 4b and 4c, these types of features were observed on all glass fibres with sizing, before and after plasma treatment
Summary
Glass fibre composites are widely used in applications where high stiffness, low weight and low cost are required, for example in ship hulls and wind turbine blades. Rask and Sørensen,[5] showed experimentally that when multiple delamination cracks 1) occurred in double cantilever beam (DCB) specimens, the resistance to crack growth scaled proportionally to the additional number of delamination cracks. The occurrence of multiple delamination cracks was not controlled. Further numerical studies of DCB specimens by Goutianos and Sørensen[6] -with a second cohesive interface parallel to the primary crack interface- showed that in order to control the formation of a second crack, the interlaminar tensile strength 1) of the second interface must be lower than the σ212 of the primary crack interface. A weak plane must be introduced near the primary crack plane to form a second crack
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