| 加强梗及蒙皮裂纹分析 |
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| 引用本文： | 于海华,王宇魁,邬建新,张敬彤,严海燕,杨书勤.加强梗及蒙皮裂纹分析[J].失效分析与预防,2020,15(1):57-61. |
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| 作者姓名： | 于海华 王宇魁 邬建新 张敬彤 严海燕 杨书勤 |
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| 作者单位： | 航空工业陕西飞机工业（集团）有限公司，陕西 汉中 723200 |
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| 摘 要： | 飞机在使用一段时间后，在发动机下盖滑油散热风口发现蒙皮及加强梗出现裂纹，通过宏微观形貌检查、电导率测试、金相组织分析、化学成分测定、扫描电镜观察、显微硬度测试等方法，对裂纹产生原因进行分析。结果表明:加强梗裂纹性质为疲劳开裂，裂纹主要是受已开裂蒙皮与连接接头在交变载荷的作用而形成的；蒙皮裂纹性质为铆钉孔的应力集中造成的疲劳开裂。
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| 关 键 词： | 加强梗 蒙皮 疲劳裂纹 交变载荷 应力集中 |
| 收稿时间： | 2019-09-28 |
Analysis of Cracks in Strengthening Stem and Skin |
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| YU Hai-hua,WANG Yu-kui,WU Jian-xin,ZHANG Jing-tong,YAN Hai-yan,YANG Shu-qin.Analysis of Cracks in Strengthening Stem and Skin[J].Failure Analysis and Prevention,2020,15(1):57-61. |
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| Authors: | YU Hai-hua WANG Yu-kui WU Jian-xin ZHANG Jing-tong YAN Hai-yan YANG Shu-qin |
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| Abstract: | After the aircraft was used for a period of time, cracks were found in the skin and strengthening stem of the lubricating oil heat dissipation outlet of the lower cover of the engine. The reasons for the cracks were analyzed by means of macro and micro morphology examination, electrical conductivity test, metallographic structure analysis, chemical composition determination, scanning electron microscope observation, and microhardness test. The results show that the crack of the strengthening stem is fatigue crack, which was mainly formed under cyclic loading of the cracked skin and the joint. The crack of the skin is fatigue crack caused by stress concentration of rivet hole. |
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