上下曲轴箱缝合螺栓断裂失效分析  

Failure Analysis on Up-down Crankcase Connecting Bolt

作　　者：兰银在[1] 陈泽忠[1] 曹春芳[1] 强智臻[1] 韩文刚[1] 崔艳军[1] 

机构地区：[1]中国北方发动机研究所(天津),天津300400

出　　处：《热加工工艺》2015年第16期236-237,243,共3页Hot Working Technology

基　　金：国防科技"十二五"重点预研项目(40402020102)

摘　　要：通过断口分析、金相检验、电镜分析、硬度测定等方法对机体上下曲轴箱缝合螺栓断裂进行了综合分析。结果表明,断裂螺栓金相组织正常,力学性能符合技术要求。该缝合螺栓的断裂为疲劳断裂,断裂原因为螺栓在工作过程中承受了交变剪切应力。The cause for fracture of up-down crankcase connecting bolt was analyzed by fractography, metallographic analysis, SEM analysis and hardness testing. The results show that the microstructure of failed bolt is normal, and the mechanical property meet the technology criterion. The cracking is fatigue fracture. The failure of the bolt is due to the bolt suffering from alternate shearing strength.

关 键 词：螺栓 疲劳断裂 失效分析 剪切应力 

分 类 号：TK407[动力工程及工程热物理—动力机械及工程]