连杆断裂失效分析

 邱元莅,田国徽,杜发明,魏巍,罗雄

(成都市特种设备检验院,四川 成都 610036)
摘要:通过发动机连杆断口宏微观观察、成分分析、金相组织检查以及拉伸性能分析等方法对发生断裂的连杆进行了失效分析。分析结果表明:连杆断裂性质为疲劳断裂。连杆在工作过程中,受到弯曲应力作用,在端角部位萌生疲劳裂纹,在循环载荷作用下裂纹扩展,直至连杆断裂。
关键词:失效分析;疲劳断裂;拉伸性能;微观分析
中图分类号:U464.133+.2 文献标志码:A doi:10.3969/j.issn.1006-0316.2018.05.007
文章编号:1006-0316 (2018) 05-0026-03
Failure Analysis on Fracture of Connecting Rod
QIU Yuanli,TIAN Guohui,DU Faming,WEI Wei,LUO Xiong
( Chengdu Special Equipment Inspection Institute, Chengdu 610036 , China )
Abstract:The connecting rod was analyzed by means of macroscopic and microscopic fracture observation、component analysis、metallographic examination and tensile properties analysis. The result shows that the nature of fracture is fatigue. The connecting rod was subjected to the bending stress in the course of working, and the fatigue crack was produced at the end corner, and the crack expands until the connecting rod breaks under the cyclic load.
Key words:failure analysis;fatigue fracture;tensile property;microanalysis
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收稿日期:2017-10-24
作者简介:邱元莅(1985-),男,四川成都人,本科,工程师,主要从事特种设备检验检测、材料性能测试等工作。
 

 

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