飞机起落架活塞杆断裂原因分析  

Reason Analysis of Fracture of Piston Rod Connector Used in Aircraft Landing Gear

作　　者：樊建勋[1] 刘国光[1] 

机构地区：[1]海军驻阎良地区航空军事代表室,陕西西安710089

出　　处：《分析测试技术与仪器》2010年第4期242-245,共4页Analysis and Testing Technology and Instruments

摘　　要：针对飞机起落架活塞杆在外场使用过程中裂纹失效问题,利用扫描电子显微镜对其断裂面微观形貌进行观察,研究其断裂机理.结果表明:该活塞杆断裂性质为服役过程中循环应力作用下的疲劳断裂.应力使活塞杆件表面出现微裂纹,在其内部形成微孔.随着应力循环次数增加,微孔的数量和大小都不断增加,最终导致了钢的疲劳断裂.通过优化其热处理工艺,使活塞杆获得良好的强韧配比,提高了抗疲劳性能.In order to understand the reason of the fracture of the piston rod used in aircraft landing gear during the service process, its microscopic morphology was investigated using SEM, and the root causes were studied. The results showed that the fatigue fracture under cyclic stress during the service process leads to the formation of micro-cracks on the surface of the piston rod, and the formation of micro-pores in its interior, where dislocations gathered and stress concentrated. With the increase of the cyclic times of stress, the number and size of micropores increase continuously, which, finally, leads to the fatigue fracture of the material. By means of optimizing the heat treatment, the strength and toughness of the connector can be well balanced, and its fatigue resistance can be improved in practice.

关 键 词：活塞杆 30CRMNSINI2A钢 断裂 扫描电镜 

分 类 号：O657.32[理学—分析化学]