By analyzing the chemical composition,microstructure,and macro-and micro-morphology of the engine crankshaft cracks,combined with hardness measurement and mechanical property testing,the failure cause of the crankshaft cracks was comprehensively analyzed.The results showed that the fatigue source of the crankshaft fracture was located in the inner wall of the connecting rod journal oil hole,approximately 7mm from the surface of the connecting rod journal.At this location,due to poor processing quality in some ar-eas of the inner wall of the connecting rod journal oil hole,the fatigue source was initiated,which exacerbated the formation of cracks inside the journal,eventually inducing crack failure during continuous fatigue propagation.
关键词
大功率/曲轴/疲劳裂纹/失效分析
Key words
high power/crankshaft/fatigue crack/failure analysis
维普
万方数据