某辅助动力装置燃油总管裂纹故障分析  

Failure Analysis of Fractured at Fuel Manifold in Auxiliary Power Unit

作　　者：邹子剑 李东杰 李继世 张大义[2] ZOU Zi-jian;LI Dong-jie;LI Ji-shi;ZHANG Da-yi(AECC Hunan Aviation Powerplant Research Institute,Zhuzhou Hunan 412002,China;School of Energy andPower Engineering,Beijing University of Aeronautics and Astronautics,Beijing 210016,China)

机构地区：[1]中国航发湖南动力机械研究所,湖南株洲412002 [2]北京航空航天大学能源与动力学院,北京100083

出　　处：《装备制造技术》2019年第2期194-200,共7页Equipment Manufacturing Technology

摘　　要：某型辅助动力装置燃油总管采用聚四氟乙烯软管,在外场发生裂纹故障,裂纹部位在金属管接头与聚四氟乙烯内管的接触处。采用断口分析并利用ANSYS进行管路装配应力仿真计算对燃油总管裂纹故障进行了分析。结果表明,燃油总管装配应力较大是引起疲劳裂纹的主要原因。基于应变能最小原理,提出了一种管路装配的改进措施,可有效减少管路在装配时的应力集中。Fuel manifold with PTFE hose in an auxiliary power unit fractured at the end of pipe junction between the metal joint and the PTFE inner pipe.The failure cause of the manifold was analyzed by fracture surface observation and fuel manifold assembly stress simulation calculation on ANSYS.The result show that the fatigue fracture of the fuel manifold mainly result from excessive assembly stress during assembly.Base on principle of minimum strain energy,put forward a improved pipe assembly method,the assembly stress should reduce.

关 键 词：燃油总管 聚四氟乙烯软管 疲劳裂纹 装配应力 ANSYS 

分 类 号：V233.2.4[航空宇航科学与技术—航空宇航推进理论与工程]