【摘要】 汽车发动机风扇叶片在汽车运行中断裂.对断裂叶片的断口进行了宏、微观分析,并追踪了风扇的生产工艺,探明了叶片失效的主要原因是冲压工艺不当产生了微裂纹,在随后的工作应力作用下,产生疲劳断裂.改进工艺后避免了该类失效事故的发生.更多还原

【Abstract】 Automobile engine fan blad fractured during operation. The failed blade was analysed in scan-ning electron microscopy. Unused blade was examined by NDT technique and microcrachk was detected. The mi-crocrack was formed due to improper punch technique and propagated during operation, leading to fatigue fracture of blade. Therefore, the punch technique was modified to avoid further blade accident.更多还原