Design of composite preform fabrication methods for turbine engine components

摘要

In order to reduce weight on future gneeration gas turbine engines, composite materials are being implemented for their inherently high strength to weight ratio. The properties of these materials can be tailored to optimize the strength to meet the given thermal and mechanical loading. Unique preform fabrication methos have been developed for several turbine engine applications. A carbon fiber blisk was fabricated net shape, with continuous fibers from the blade tips to inner hub. A low pressure turbine airfoil with complex twist dimensional Hi-Nicalon~TM braids are being implemented into turbine airfoils to meet extreme loading conditions. Three-dimensional braids can also provide a design and fabrication advantage for composite dovetails. Each of these representative applications has been tailored to meet hte specific loading and end-use condition.s Using hte examples described above as case histories, this paper explores the preform fabrication development for composite engine components, and the benefits of each. The advantages and disadvantages preform fabrication methods will be discussed as well.