复合材料飞轮的损伤与断裂研究

The experimental study by acoustic emission technology and scanning electro microscope on the damage and fracture of the material of composite flywheel filament wound was carried out in this research project. The test singles obtained were analyzed by fuzzy theory, and the experimental database needed for the optimum design of the flywheel was built up, and the theoretical and foundation for the design, manufacture and safety is provided.The back ground of the project：The air pollution and noise pollution produced by automobiles are now becoming serious damage to the world. The electricity powered vehicles give no air pollution and low noise，meeting the environmental requirements and leading the future of the vehicles. But the solar energy batteries and the newly developed fuel batteries have not found their commercial applications in industries because of high cost， and the lead acid batteries reduce the function of the vehicles because of low energy storage density . The energy storage composite flywheels can provide at least triple of the energy of the best lead acid batteries，which can also be used the system of generation and distribution of electricity . The energy storage flywheels are made from fiber composites by filament winding， and can work at ultra high rotation speed of 200000r/m. Obviously， the working safety of the flywheel is the most important thing for the vehicles . Much work about the flywheel has already published，but most of them were concentrated on mechanical analysis . The emphasis of this research project is put on the experimental study of damage and fracture of the composite flywheels..The result of the project：The following results have been obtained.①The method of optimum design of the composite flywheel is obtained；②The data base of acoustic emission test of the damage and fracture of unidirectional fiber composites is built up； ③The acoustic emission test of the damage and fracture of composite flywheel under isotropic pressure is progressed and the damage singles were analyzed; ④The composite flywheel.specimens were speeded up until fracture, and the fracture behavior is obtained;⑤ A new idea of intelligent composite flywheel is proposed .

采用细观力学理论及声发射、扫描电镜、核磁共振和差热分析等现代实验手段对超高速旋转的的磁悬浮复合材料飞轮材料中损伤和裂纹的发生和发展规律进行分析并对飞轮进行超载破坏旋转实验研究，应用小波神经网络处理损伤信号，建立复合材料飞轮疲劳寿命判断系统，为电动汽车新型动力电源用储能飞轮的设计、制造和应用提供理论和实验基础。