| 聚四氟乙烯软管气蚀引起疲劳损伤的形貌分析 |
| |
| 引用本文： | 陈荣,阎旭,张东方,夏洪花,宋科.聚四氟乙烯软管气蚀引起疲劳损伤的形貌分析[J].失效分析与预防,2021,16(4):271-276. |
| |
| 作者姓名： | 陈荣 阎旭 张东方 夏洪花 宋科 |
| |
| 作者单位： | 北京航空工程技术研究中心，北京 100076 |
| |
| 摘 要： | 飞机液压系统用聚四氟乙烯软管在使用中先后发生10余起软管内壁穿孔造成的渗漏故障。利用视频显微镜、扫描电镜等对故障软管进行宏观及微观形貌分析。结果表明:故障软管具有相同的失效特征及模式，属于气蚀引起的疲劳损伤；结合软管工作环境，探讨软管气蚀疲劳损伤的机理，总结气蚀引起疲劳损伤的形貌特征，即宏观上损伤区为蜂窝状孔洞形貌，微观上孔洞由多个小疲劳区组成，可见疲劳条带特征；裂纹早期从表面或次表面萌生，基本以平行于表面的疲劳扩展为主；液压软管气蚀疲劳损伤的形成与气蚀的冲击波机制较为吻合。
|
| 关 键 词： | 聚四氟乙烯软管 气蚀 疲劳 形貌分析 |
| 收稿时间： | 2021-04-20 |
Morphology Analysis on Fatigue Failure of PTFE Pipe Caused by Cavitation Erosion |
| |
| CHEN Rong,YAN Xu,ZHANG Dong-fang,XIA Hong-hua,SONG Ke.Morphology Analysis on Fatigue Failure of PTFE Pipe Caused by Cavitation Erosion[J].Failure Analysis and Prevention,2021,16(4):271-276. |
| |
| Authors: | CHEN Rong YAN Xu ZHANG Dong-fang XIA Hong-hua SONG Ke |
| |
| Abstract: | A dozen of polytetrafluoroethylene (PTFE) pipe leakage occurred on hydraulic system of a certain aircraft. Three-dimension microscope and SEM were used to analyzed macro and micro morphology of faulty PTFE pipe. The results showed that these PTFE pipes hade same failure characteristics and failure mode, which is named fatigue failure caused by cavitation erosion. The paper analyzed working condition of PTFE pipe, investigated failure mechanism of cavitation erosion, and concluded fractal characteristics of fatigue failure caused by cavitation erosion. Characteristic features of such failures included: 1) feature of damage zone were honeycomb-like caves macroscopically, 2) caves consisted of small fatigue zones microscopically, 3) cracks that propagate first at surface or subsurface and then parallel to the surface of pipe, and 4) fatigue striations on the fracture surfaces. Fatigue failure caused cavitation erosion of PTFE pipes could be described by shock wave mechanism. |
| |
| Keywords: | |
|
| 点击此处可从《失效分析与预防》浏览原始摘要信息 |
|
点击此处可从《失效分析与预防》下载全文 |
|
