Clean Technology 2007
M.V. Kireitseu, G.R. Tomlinson and V. Basenuk
Rolls-Royce Centre in Damping, the University of Sheffield, UK
CNT-reinforced composite, damping, coating
Material and Fan Blade Design Concepts shown in fig. 1 are introduced as follows: <br>1) CNT-reinforced micro-balloons to be used to create syntactic foam (an two-part epoxy adhesive filled with micro-balloons) such that the density of the foam is about 1000 kg/m3. CNT-reinforced syn-tactic foams as filler for rotating fan blades of turbine engine (Fig. 1). <br>Motivation: Volume and weight of filler material should be minimized. In large civil engines, the blades are hollow and usually have stiff rib-like metallic structures in order to increase the rigidity and maintain cross-sectional profile of the blade. The filled fan concept is to replace this metal structure with CNT-reinforced syntactic foam simultaneously acting as a strengthener and a damping element. <br>2) CNT-reinforced damping coatings: both single layer and multi-layered sandwich structure. <br>Motivation: Coating has considerable adhesion and adds significant damping to titanium fan blades. Ceramic coating is desirable in high temperature applications, but its damping level is lower than that of polymeric ones. Another problem is fracture and fatigue of hard coatings on dynamic blade. <br>Achieved objectives of research were 1) to reduce stress in fan blades at resonance by 50%; 2) increase stiffness by 30%; 3) enhance damping by 30%; and 4) match integrity of components.