Damage tolerant Thin-Ply Carbon Fiber Reinforced Composites with Graphene enhanced Matrix

其目的是优化纤维增强聚合物（FRP）的机械性能，具有薄层层压结构和纳米颗粒基体改性，特别是在抗冲击损伤容限方面。对于许多部件来说，自由边缘对早期材料损坏的抵抗力非常重要。通过减小层压材料的单层厚度可以实现该性能的优化。使用这种称为薄层的技术，可以在复合材料层压板的总厚度恒定的情况下显著减少损伤量，例如微裂纹。然而，由于断裂韧性较低，损伤量较小会对开孔试样的力学性能和抗冲击损伤能力产生不利影响。因此，与相同厚度的传统层压板相比，薄层层压板的极限静强度较低，并且它们显示出脆性破坏类型。由于在冲击损伤的缺陷的发展主要是由基体占主导地位的机械性能的影响，它是要调查，这些缺点的薄层层压板是否可以补偿的聚合物改性增加断裂韧性与插入的纳米粒子。用石墨烯纳米颗粒对基体进行改性是一种很有前途的方法，已经广泛应用于优化传统FRP。将生产具有薄层层压结构和石墨烯纳米颗粒基体改性的纤维增强聚合物，并研究失效机制，层厚度和层取向以及石墨烯纳米颗粒的影响，以挖掘这些有前途的新材料的全部潜力。

The objective is to optimise the mechanical properties of fibre reinforced polymers (FRP) with a thin-ply laminate structure and a matrix modification with nanoparticles particularly with regard to the damage tolerance against impacts. The resistance against early material damage at free edges is of great importance in many components. An optimisation of this property can be achieved by reducing the single ply thickness of the laminate. With this technology, called thin-ply, the amount of damage, such as microcracking can be significantly reduced at constant total thickness of the composite laminate. However, the smaller amount of damage has negative influence of the mechanical properties of open-hole specimen and with regard to the resistance against impact damage, because of the lower fracture toughness. Thus, the ultimate static strength of thin-ply laminates is lower in comparison to traditional laminates of the same thickness and they show a brittle type of failure. Since the defect development at impact damage is mainly influenced by matrix dominated mechanical properties, it is to be investigated, whether these disadvantages of the thin-ply laminates might be compensated by a polymer modification increasing the fracture toughness with an insertion of nanoparticles. A matrix modification with graphene nanoparticles is here a promising approach that is already applied extensively for optimising traditional FRP. Fibre reinforced polymers with a thin-ply laminate structure and a matrix modification with graphene nanoparticles are to be produced and the failure mechanisms, the influence of ply thickness and layer orientation as well as graphene nanoparticles is to be investigated in order tap the full potential of these promising new materials.