东风-41996内燃机车连杆螺栓及活塞断裂分析  

Fracture Analysis of Diesel Engine Connecting Rod Bolt and Piston for DF_4 Locomotive 1996

作　　者：李爱姣[1] 

机构地区：[1]兰州铁道学院机电与动力工程学院,甘肃兰州730070

出　　处：《兰州铁道学院学报》2002年第6期53-55,共3页Journal of Lanzhou Railway University

摘　　要：采用金相分析、断口分析和硬度分析方法,对东风41996内燃机车柴油机连杆螺栓及活塞断裂的原因进行了分析,确认连杆螺栓因机加工不当引起疲劳裂纹的萌生及扩展,加之螺栓受力不均匀加速了疲劳断裂过程,活塞因材质、结构缺陷导致破碎.提出了预防连杆螺栓和活塞失效的措施及改进建议.Fracture analysis, metallographic examination and hardness test were used to study the fracture of the connecting rod bolt and the piston for DF4 locomotive. The results show that manufacturing defects of the bolt resulted in initiation and propagation of fatigue crack, and uneven loading of the bolt speeded up failure process of fatigue fracture, the piston damage resulting from the defect of material and construction. Prevention measures for fatigue fracture of the bolt and damage of the piston were proposed.

关 键 词：东风41996内燃机车 连杆螺栓 活塞 疲劳断裂 失效分析 柴油机 

分 类 号：U269.5[机械工程—车辆工程] TK423[交通运输工程—载运工具运用工程]