| 发动机高压燃油泵开裂分析 |
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| 引用本文： | 都建京,魏振伟,赵文侠,刘昌奎.发动机高压燃油泵开裂分析[J].失效分析与预防,2019,14(3):179-183. |
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| 作者姓名： | 都建京 魏振伟 赵文侠 刘昌奎 |
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| 作者单位： | 中国航发北京航空材料研究院,北京,100095;中国航发北京航空材料研究院,北京100095;航空材料检测与评价北京市重点实验室,北京100095;中航工业失效分析中心,北京100095 |
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| 摘 要： | 发动机燃油系统高压燃油泵在经过2次长试后,经荧光检查发现出油口有裂纹。采用宏观观察、金相观察、扫描电镜分析、能谱分析及显微硬度分析等手段,对燃油泵裂纹产生的原因进行研究。结果表明:高压燃油泵裂纹起源于出油口转角R处,裂纹性质为疲劳开裂;燃油泵受力分析结果显示出油口R角为应力较大区域,该区域构件表面出现链状点蚀,增加了应力集中,促进了疲劳裂纹的萌生。
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| 关 键 词： | 高压燃油泵 2A14铝合金 点蚀 疲劳 |
| 收稿时间： | 2019-04-03 |
Cracking Analysis of High Pressure Fuel Pump of Aero-engine |
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| DU Jian-jing,WEI Zhen-wei,ZHAO Wen-xia,LIU Chang-kui.Cracking Analysis of High Pressure Fuel Pump of Aero-engine[J].Failure Analysis and Prevention,2019,14(3):179-183. |
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| Authors: | DU Jian-jing WEI Zhen-wei ZHAO Wen-xia LIU Chang-kui |
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| Affiliation: | (AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095,China;AVIC Failure Analysis Centre,Beijing 100095,China) |
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| Abstract: | After two long-time tests, the high pressure fuel pump was found to have cracks on the oil-out by fluorescence detection. The failure reasons of the fuel pump were studied by macroscopic observation, metallographic analysis, scanning electron microscopy, energy dispersive spectroscopy and micro-hardness analysis. The results show the crack initiated from the R corner of the oil-out and the crack is fatigue crack. The results of stress analysis show that there was stress concentration at the R corner. In addition, there was pitting corrosion at the R corner surface, increasing stress concentration and promoting the initiation of the fatigue crack. |
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| Keywords: | high pressure fuel pump 2A14 aluminum alloy pitting fatigue |
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