航空铝合金管路连接件液压脉冲失效研究  

Failure Research of Aviation Aluminum Pipe Connection Assemblies Under Hydraulic Pulse

作　　者：吴子龙 张宗华[1] 隋明丽[1] WU Zi-long;ZHANG Zong-hua;SUI Ming-li(China Aero-Polytechnology Establishment, Beijing 100028, China)

机构地区：[1]中国航空综合技术研究所,北京100028

出　　处：《液压气动与密封》2018年第5期29-32,共4页Hydraulics Pneumatics & Seals

摘　　要：飞机燃油系统用铝合金管路连接件输油时,要承受变化的油压,在模拟实际工况的液压脉冲试验中,管路连接件因靠近装配位置的导管出现了贯穿内外表面裂纹,发生失效。通过扫描电子显微镜观察,裂纹起源于导管外表面条纹微缺陷,在液压脉冲作用下,裂纹沿着管径向导管内部不断的延性扩展,当导管的裂纹所在区域无法承受液压脉冲峰值压力时,裂纹直接贯穿至导管内表面。最后,提出了提高管路连接件导管的抗液压脉冲疲劳性能的措施。When pipe connection assemblies of aircraft fuel system supply oil, the oil pressure changs all the time. During hydraulic pulse test simulating the actual working condition, a crack appeared through inside and outside surface of the pipe close to assembly position, and pipe connection assemblies failure occurred. The crack analyzed by the scanning electron microscope originated the micro stripes defects of pipe, and under the action of a hydraulic pressure pulse, the crack expanded to inside constantly along the pipe diameter. When the pipe could not afford to hydraulic pulse peak pressure, the crack intersected directly to the inner surface of pipe. Finally, the measures to improve the fatigue performance of the pipe were put forward.

关 键 词：航空 液压脉冲 管路连接件 失效分析 

分 类 号：TH137[机械工程—机械制造及自动化]