Vibration Characteristic Analysis Technology Of 3-D Woven Composite Structure

Since 1960s, the advanced composite, especially the advanced resin matrix composite, has been greatly developed in the world for its unique characteristic. And it has been one of the most important materials of modern aerospace industry. Because of the whole braid of the multi-orientations,braided composite materials overcome the defects of the traditional laminate composite and reinforce the equality of intensity in every orientation,and is a new advanced material for the time being,and widely applied in many industries,such as aerospace industry etc.In this paper,the research work is mainly including following: (1) This paper introduces the research and application conditions of 3D woven technique and RTM. It also recounts the research condition of 3D woven composite. (2) The numeric simulation trial of a planar models are made by an emulator of RTM mould filling process. After that, plate mould and thicken panel mould are designed. (3) Five fabrics were woven with constructions of layer to layer angle interlock binding. and the composite flat panel and thicken panel are successfully made. (4) Numerical model on typical construction of woven fabrics are derived. The mechanical model of 3D woven composite is set up to analyze it's mechanical properties, and was validated by the stretch mechanics performance tests of the 3D woven composites have been made. (5) Dynamic mechanical characteristics of 3D woven composite beams are studied by means of the software of ANSYS and the experimental modal analysis technique. The vibration modal parameters such as natural frequencies, damping ratios are analyzed. The study work provides powerful technique support for the design and manufacture of composite blade.