| 航空发动机油管固定支架断裂失效分析 |
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| 引用本文： | 卜嘉利,高志坤,佟文伟,孙佳斯.航空发动机油管固定支架断裂失效分析[J].航空发动机,2020,46(3):40-45. |
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| 作者姓名： | 卜嘉利 高志坤 佟文伟 孙佳斯 |
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| 作者单位： | 中国航发沈阳发动机研究所,沈阳110015,中国航发沈阳发动机研究所,沈阳110015,中国航发沈阳发动机研究所,沈阳110015,中国航发沈阳发动机研究所,沈阳110015 |
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| 基金项目： | 航空动力基础研究项目资助 |
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| 摘 要： | 为探明某航空发动机油管固定支架断裂故障的性质和原因,对断裂支架进行外观检查、断口宏观和微观分析、表面检查、成分分析、组织检查、重熔层检查和有限元分析。结果表明:支架断裂故障的性质为疲劳断裂,其原因为在装配结构拉力和振动应力共同作用下,在支架内侧表面重熔层中微裂纹处萌生了疲劳裂纹,最终导致支架断裂。建议采用激光-电解复合加工技术对支架表面进行加工以去除重熔层、微裂纹和无热影响区,并在装配过程中严格控制预紧力以提高装配质量。
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| 关 键 词： | 固定支架 重熔层 疲劳断裂 有限元分析 失效分析 航空发动机 |
Fracture Failure Analysis of Fixed Bracket for Aeroengine Oil Tube |
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| Authors: | BU Jia-li GAO Zhi-kun TONG Wen-wei SUN Jia-si |
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| Affiliation: | (AECC Shenyang Engine Research Institute,Shenyang 110015,China) |
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| Abstract: | In order to find out the nature and cause of the fracture failure of the fixed bracket for a aeroengine oil tube,the appearance inspection,macroscopic and microscopic analysis,surface inspection,composition analysis,organization inspection,remelting layer inspection and finite element analysis of the fracture bracket were carried out.The results show that the fracture fault of the bracket is fatigue fracture,which is caused by the initiation of fatigue crack at the microcrack in the remelted layer on the inner surface of the bracket under the action of assembly structure tensile force and vibration stress.It is suggested that the surface of the bracket should be machined by laser-electrolysis to remove the remelted layer,microcracks and heat-free zone,and the pretightening force should be strictly controlled during the assembly process to improve the assembly quality. |
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| Keywords: | fixed bracket remelted layer fatigue fracture finite element analysis failure analysis aeroengine |
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