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Influence of the interface structure on the micro-mechanical failure mechanisms of metallised fibre-reinforced polymers

The use of fibre-reinforced plastics (FRP) for leightweight vessels for i.e. liquid hydrogen are of special interest due to their high stiffness and strength to weight ratio. However, fiber reinforced plastics have very high permeability and leakage rates for hydrogen compared to metal. To meet these high leak-tightness requirements a copper coating can be used as a highly functional permeation barrier. But the use of copper coated fibre reinforced plastics for storage systems presents a specific challenge for a stable polymer metal composite regarding the interphase between the composite substrate and the coating. Thus, the goal of the work was to improve the adhesion between thermoset fibre-reinforced plastics and electroplated copper coatings by a specific surface treatment and to quantitatively investigate occuring failure mechanisms particularly within the interphase by means of acoustic emission analysis. The peel strength of 0,8 N/mm could be exceeded by chemical treatment of a polyester fleece modified GFRP-Substrate with acetic acid and hence an alternative more gentle pre-treatment method to chromic acid could be developed. Two different failure mechanisms within the interphase could be correlated with the results from acoustic emission signal analysis during peel testing, namely adhesive and cohesive failure. Futhermore, a quantification of the amount of each interphase failure mechanism was possible. During quasistatic tensile testing, differences in peak frequency, frequency distribution and the use of pattern recognition techniques allowed classifying the signal into three failure mechanisms for the uncoated samples and four failure mechanisms for the coated samples, namely matrix cracking, fibre-matrix interface failure, fibre breakage and substrate-coating interface failure.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Edin Njuhovic

Edin Njuhovic
Fakultät für Ingenieurwissenschaften
Universität Bayreuth

Information

Free keywords: Fibre-reinforced plastic, metallisation, interface structure, adhesion, micro-mechanical failure mechanisms, acoustic emission analysis
Institute / chair: Lehrstuhl für Polymere Werkstoffe der Universität Bayreuth
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt, Prof. Dr.-Ing. Dietmar Drummer
Publication year: 2018
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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