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Item type:Publication, Access status: without files , Maximizing bearing fatigue lifetime and CAI capability of fibre metal laminates by nanoscale sculptured Al pliesThis paper presents an experimental investigation of multifunctional fibre metal laminates (FMLs). Metal sheets are embedded into the hybrid composites by means of glass fibre reinforced polymer (GFRP) ply substitution, avoiding any laminate thickening and providing high bearing and compression after impact (CAI) capabilities. The Al sheets (AA6082) are nanoscale sculptured to prevent premature delamination between the metal and the matrix, which commonly occurs in conventional FMLs. The laminates are manufactured by resin transfer moulding. As a result the FMLs show drastically increased mechanical properties compared to conventional GFRP laminates for structural applications, achieving values for static pin-bearing (up to 21%), static bolt-bearing (up to 2%), resistance under fatigue pin-bearing (up to 100 times), resistance under fatigue bolt-bearing (up to 28 times) and CAI (up to 9%). The pre-treatment leads to a three-dimensional mechanical interlocking surface structure with highly improved inter-ply bonding between metal surface and resin. The fracture surface demonstrates that the adhesive bond between the nanoscale sculptured surface structure of the Al and matrix remains intact.Publicationtype: Journal Article224 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Reaching maximum inter-laminar properties in GFRP/nanoscale sculptured aluminium ply laminatesThe aim of the present work is to reach maximum inter-laminar properties in fibre metal laminates (FML) consisting of glass fibre reinforced polymer (GFRP) and aluminium (Al) plies. The Al plies are AA5019 and AA5754 alloys and pre-treated by nanoscale sculpturing before the FMLs are manufactured by resin transfer moulding. The nanoscale sculpturing of the Al plies leads to the formation of cubical hook-like structures on the surface giving rise to a three-dimensional mechanically interlocking surface. The inter-laminar properties of the FML are investigated by double-notch shear as well as double cantilever beam (Mode I) and end notched flexure (Mode II) testing methods and compared to untreated Al plies and conventional GRFP laminates as reference. As result the nanoscale sculptured Al plies show drastically increased inter-laminar mechanical properties due to highly improved inter-ply bonding between metal surface and resin. For all FMLs with nanoscale sculptured Al plies the delamination appears in the transition zone between glass fibres and matrix due to the lower adhesion of the glass fibre/matrix interface compared to the nanoscale sculptured Al ply/matrix interface. This proves that the maximum necessary inter-laminar properties are achieved.Publicationtype: Journal Article185