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Joining of aluminum and CFRP parts using titanium foils as transition elements

: Woizeschke, P.; Schumacher, J.; Specht, U.; Lang, A.; Vollertsen, F.

Hausmann, J. M.; Siebert, M. ; Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel:
Euro Hybrid Materials and Structures 2014. Proceedings CD-ROM : International conference. 10 - 11 April 2014, Stade, Germany
Stade: DGM, 2014
ISBN: 978-3-88355-402-0
Conference Euro Hybrid Materials and Structures <2014, Stade>
Conference Paper
Fraunhofer IFAM ()

Multi-material design allows the adaptation of structural properties to specific local requirements. Especially, aluminum alloys (Al) and carbon fiber reinforced plastics (CFRP) are materials of great interest for the automotive and aircraft industries. Thus, the research group "Schwarz-Silber" (DFG FOR1224) located at the University of Bremen aims to develop and investigate novel concepts for advanced Al-CFRP joining techniques using transition structures. In the "foil concept" titanium (Ti) foils are used as transition elements. The Ti-CFRP sub-joint is generated by replacing CFRP layers stepwise with the titanium foils. Titanium surfaces are pre-modified by using a pulsed laser treatment to increase the interlaminar shear strength. The pure titanium side of the hybrid Ti-CFRP laminate is joined to an aluminum sheet using a heat conduction laser beam process. In this paper, the manufacturing process of such Al-Ti-CFRP joints is presented. Properties of these specimens are discussed with respect to their behavior in tensile tests. Different failure modes have been observed. A tensile strength of 96 N/mm² in average of all observed failure locations has been calculated by normalizing the maximum tensile force to the cross-sectional area of the aluminum base sheet.