Leon Mishnaevsky Jr. and Gaoming Dai,, Technical University of Denmark, DTU Wind, Risø Campus,DK-4000 Roskilde, Denmark 

Hybrid and hierarchical polymer composites with CNT and graphene reinforcements represent a promising group of materials for engineering applications. In this paper, computational studies of the strength and damage resistance of hybrid and hierarchical composites are reviewed. The reserves of the composite improvement are explored by using computational micromechanical models. It is shown that the secondary nanoreinforcement can drastically increase the fatigue lifetime of composites. Especially, composites with the CNTs localized in the fiber/matrix interface layer (fiber sizing) ensure much higher fatigue lifetime than those with the CNTs in the matrix. It was further concluded that the structural imperfections of graphene reinforcement (like crumpling shape or random misalignment) have considerable effect on the composite performances.

Leon Mishnaevsky Jr, is a Senior Scientist at the Technical University of Denmark. Author of 3 mono-graphs and more than 100 papers on computational micromechanics and modelling of nanomaterials and hierarchical materials including carbon, graphene and CNT reinforced composites. He received his doctorate from the Russian Academy and his Dr. - habil. degree (thin films) from TU Darmstadt, Germany. He has held visiting professor/visiting. scholar positions at M.I.T. and Rutgers (USA), Uni Tokyo (Japan) and ENSAM (France). Prior to joining DTU, he worked as a Heisenberg Fellow at the Uni Stuttgart, and TU Darmstadt and earlier as postdoc at TU Vienna.