| 燃油测压导管断裂分析 |
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| 引用本文： | 林文钦,胡成江,朱丽,郑洪,吴旻. 燃油测压导管断裂分析[J]. 失效分析与预防, 2018, 13(5): 288-292. DOI: 10.3969/j.issn.1673-6214.2018.05.004 |
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| 作者姓名： | 林文钦 胡成江 朱丽 郑洪 吴旻 |
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| 作者单位： | 中航工业成都飞机工业(集团)有限责任公司, 成都 610091 |
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| 摘 要： | 燃油测压导管服役中发生断裂，造成燃油泵报警。对断裂导管进行断口形貌和痕迹分析，结果表明:导管属疲劳断裂，与受到较大弯曲振动应力有关；管身磨损痕迹和位置说明卡箍未有效固定导管，这是造成导管应力载荷较大的原因。后续调查显示技术管理存在不足，使得执行装配工艺更改不及时，以致卡箍未起作用。导管在装配时由工人自弯成形，测得导管端头直线段长度小于技术要求，这会增加导管装配应力，对导管断裂具有促进作用。
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| 关 键 词： | 导管 疲劳断裂 弯曲振动 技术管理 |
| 收稿时间： | 2018-06-25 |
Fracture Analysis of Fuel Pipe for Measuring Pressure |
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| LIN Wen-qin,HU Cheng-jiang,ZHU Li,ZHENG Hong,WU Min. Fracture Analysis of Fuel Pipe for Measuring Pressure[J]. Failure Analysis and Prevention, 2018, 13(5): 288-292. DOI: 10.3969/j.issn.1673-6214.2018.05.004 |
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| Authors: | LIN Wen-qin HU Cheng-jiang ZHU Li ZHENG Hong WU Min |
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| Abstract: | A fuel pipe for measuring pressure fractured during service, resulting in the alarm of the fuel pump. In this paper, the fracture surface morphology and trace were analyzed. The results show that the fracture mode of the pipe is fatigue fracture, which was mainly caused by greater bending vibration stress. The wear trace and location of the pipe body indicate that the clamp didn't effectively fix the pipe, resulting in greater bending vibration stress. Subsequent survey shows that there was a deficiency in technology management, and thus the assembly process improvement hadn't been carried out in time, so the clamp hadn't work. When the pipe was assembled, it was bended by a worker. The length of the straight section of the pipe end is lower than the technical requirement, increasing assembly stress and promoting rupture. |
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