EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Layered material compounds of thin metal sheets and fibre-reinforced plastics (FRP) combine the advantages of the individual components. A decisive advantage is the tailor-made design by combining different compositions, material fractions and fibre orientations depending on the application and load direction. In this work the thermoplastic based hybrid laminate CAPAAL 2/1 composed of a 1.25 mm graded glass- and carbon fibre-reinforced polyamide 6 layer between two 0.5 mm thin sheets of the aluminium alloy AA6082-T4 is used to study the directional properties of this hybrid material utilizing three different configurations of the FRP-layers. The first design is the unidirectional (UD) orientation of all FRP-tapes in the rolling direction of the aluminium sheets. The hybrid laminates with bidirectional (BD) design are composed of 0 and 90° oriented FRP-tapes and the quasi-isotropic (QI) design has a composition of 0, +45, 45 and 90° FRP-tapes in a symmetrical arrangement. The various arranged thermoplastic tapes between aluminium sheets are consolidated by pressing under the pressure of 1.5 MPa and temperature of 295 °C in a dipping edge tool. The microstructure and thickness of the FRP-layer was examined by light microscopy. Tensile tests were performed on water jet cut samples in 0, 45 und 90° direction to the rolling direction of the aluminium. The quasi-isotropic design leads to balanced mechanical properties of the hybrid laminate. It was found that the tensile strength of the hybrid laminate is influenced by the orientation of the fibres. Maximum tensile strength can be reported by a UD design in fibre direction. Across the fibre direction, the tensile strength decreases strongly. Nearly isotropic properties can be reached by the quasi-isotropic design of the FRP.