The overall goal of our research, which is carried-on in the frame of the European project 'Clean Sky', is to develop novel, more efficient bonding technologies for aircraft applications. This contribution is presenting the results of an experimental program aiming at investigating the influence of different surface treatments on the mechanical properties of bonded CFRP plates. Considered surface treatments include different mechanical abrading techniques e.g. manual and electrical sanding and grit blasting, chemical etching as well as special procedures for surface treatments of composites e.g. peel ply. Additionally, the influence of release agents used during the manufacturing process of the CFRP plates has been considered. Digital microscopy is used for the analysis of the composite surface before bonding, e.g. to detect potential fiber damage caused by the different techniques, and also for the characterization of the fracture mode after failure. Bonded samples are mechanically characterized by shear and double cantilever beam (DCB) tests.
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