The influence of a matrix modification with few-layer graphene (FLG) nanoparticles in different layers of carbon fibre reinforced plastic cross-ply laminates is investigated. Either the 90°-layers or the 0°-layers are modified with FLG nanoparticles. Quasi-static-tension tests with combined acoustic emission analysis are executed to determine the influence of the nanoparticle modification on tensile strength and stiffness, as well as the stress at inter fibre failure (IFF) initiation. FLG modification of the 0°-layers increases the tensile strength, whereas a modification of the 90°-layers increases the stress at IFF initiation. Fractography analysis of the fracture surfaces using scanning electron microscopy reveals microdamage at the nanoparticles that dissipates energy and is an explanation for the observed delay of transverse cracking in the 90°-layers when modified with FLG nanoparticles.
