Use of an Optical Textile in the Bond Line for Curing Radiation-Curable Adhesives
Authors: M. Sc. Florian Rackerseder, M. Sc. Mark Pätzel, Dr.-Ing. Maximilian Brosda Flockenhaus, M. Sc. Robert Seewald, Dr.-Ing. Martin Traub, Dr.-Ing. Alexander Schiebahn, Univ.-Prof. Prof. h. c. (MGU) Dr.-Ing. Dipl.-Wirt. Ing. Thomas Gries, Prof. Dr.-Ing. Uwe Reisgen
Radiation-curable adhesives stand out for their efficient curing; however, they require either accessibility of the bonding area or radiation transparency of the joining parts. To overcome this limitation of use, an adhesive bonding process has been developed that integrates a thin fibre-optic fabric into the bond, which guides the radiation required for curing directly into the joining zone. To achieve homogeneous radiation outcoupling, chemical and laser-structuring treatments of the polymer optical fibres were investigated. Using a graded treatment strategy, lap-shear strengths of up to 16 MPa are achieved. The choice of weft yarn material has a major influence on curing homogeneity along the fabric and on the ageing behaviour of the bonded joints. While no significant ageing effects are identified for lap-shear specimens with an integrated fabric made from PBT weft yarn, bonding with PET weft yarn shows a pronounced loss of strength.
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