Print Email Facebook Twitter Ultrasonic welding of CF/epoxy to CF/PEEK composites Title Ultrasonic welding of CF/epoxy to CF/PEEK composites: Effect of the energy director material on the welding process Author Tsiangou, E. (TU Delft Aerospace Manufacturing Technologies) Teixeira De Freitas, S. (TU Delft Structural Integrity & Composites) Villegas, I.F. (TU Delft Aerospace Manufacturing Technologies) Benedictus, R. (TU Delft Structural Integrity & Composites) Date 2020 Abstract With its short heating times, ultrasonic welding is a highly promising technique for joining thermoplastic (TPC) to thermoset (TSC) composites, to prevent thermal degradation of the thermoset adherend. A neat thermoplastic coupling layer is co-cured on the surface to be welded to make the TSC “weldable”. For welding CF/PEEK to a TSC adherend, it would be logical to use PEEK as the coupling layer. However PEEK and epoxy are not miscible with each other, therefore a bond created after co-curing of these two materials is not reliable. PEI on the other hand is known to be miscible to most epoxy systems at high temperatures and PEEK polymers, hence it is an excellent candidate for the coupling layer material. The other necessary element for ultrasonic welding is the energy director (ED), a neat TP film placed at the interface to help promote heat generation through preferential frictional and viscoelastic heating. Usually EDs are made from the same material as the TP matrix, but in this case ED can be either PEI or PEEK. Mechanical testing and fractographic analysis showed that the usage of a PEEK ED is the most successful approach. This research is part of the European project EFFICOMP. Subject CompositesEnergy directorThermoplasticsThermosetsUltrasonic welding To reference this document use: http://resolver.tudelft.nl/uuid:6e254861-090a-4796-a181-423b41dc7c23 Publisher Applied Mechanics Laboratory ISBN 9781510896932 Source ECCM 2018 - 18th European Conference on Composite Materials Event ECCM18: 18th European Conference on Composite Materials, 2018-06-24 → 2018-06-28, Athens, Greece Series ECCM 2018 - 18th European Conference on Composite Materials Part of collection Institutional Repository Document type conference paper Rights © 2020 E. Tsiangou, S. Teixeira De Freitas, I.F. Villegas, R. Benedictus Files PDF 30bd50b1ec754a2980ca0f905 ... 573a03.pdf 907.81 KB Close viewer /islandora/object/uuid:6e254861-090a-4796-a181-423b41dc7c23/datastream/OBJ/view