Matrix optimization of CFRP parts concerning fire and impact properties with process acceleration

摘要

This paper is concerned with the optimization of fire resistance, impact properties and fast curing of CFRP. The investigation is part of the CFRP fuselage project. Nanoscale additives selected from the most promising materials are used to optimize fire resistance and impact properties. The challenge is to disperse the particles thoroughly and to determine the optimal particle concentrations. The optimum has to be determined taking into consideration the expected effect and the resulting material properties. Standard fire and mechanical tests are therefore carried out together with a thermogravimetric analysis, a simple thermal material process, which is used for fast comparison of the fire properties of the material. These results are compared and the related behaviour of the fire properties can be shown for standard fire tests and the TGA. It can be shown that the impact properties of both tough and hard particles improve the impact resistance of CFRP. Rubber particles as well as CoreShell particles are particularly well-suited as toughening agents and improve the CAI values by up to 28 %. A comprehensive knowledge of the behaviour of the curing resins is necessary for reduction of the curing time of the RTM-resin, which passes through different material stages. The most effective time reduction results from the omission of several heating phases during the hardening process of a component. Neat resin test specimens are therefore produced and the mechanical properties are examined. One of the challenges is the proper filling of the RTM-component, which depends amongst other things on the resin pot life and viscosity while the resin is liquid. Standard test panels are therefore produced from different promising resins using adjusted cure cycles and finally the mechanical properties are tested.