工程车平衡悬架钢板弹簧座疲劳断裂机理研究  

Research on Fatigue Fracture Mechanism of Balanced Suspension Leaf Spring Seat of Engineering Vehicle

作　　者：何铭雪 李伟 刘昊东 黄娟 国志鹏 刘莹 He Mingxue;Li Wei;Liu Haodong;Huang Juan;Guo Zhipeng;Liu Ying(FAW JieFang Automotive Co.,Ltd.,Changchun 130011)

机构地区：[1]一汽解放汽车股份有限公司,长春130011

出　　处：《汽车工艺与材料》2024年第2期59-63,共5页Automobile Technology & Material

摘　　要：为解决某工程车平衡悬架钢板弹簧座失效断裂问题,利用工艺分析、断口分析、金相检验、强度检测、硬度检测以及材料疲劳极限检测等方法,对平衡悬架钢板弹簧座进行分析。结果表明:平衡悬架钢板弹簧座所用材料满足标准要求,平衡悬架钢板弹簧座的失效形式为多源高应力、低周次弯曲疲劳开裂,裂纹源处于平衡悬架钢板弹簧座与U型螺栓配合的圆角根部位置,该位置较厚大在生产工艺上易产生缩孔缩松等缺陷,在结构上是平衡悬架钢板弹簧座承受应力最大的位置,为零件的危险截面。In order to address the issue of failure fracture of balance suspension leaf spring seat of engineering vehicle,this paper analyzed the balance suspension leaf spring seat by process analysis,fracture analysis,metallographic examination,strength test,hardness test and material fatigue limit testing.The results show that the material used in the balance suspension leaf spring seat meets the standard requirements,and the failure modes include multi-source high stress and low cycle bending fatigue cracking,the crack originates from the rounded root between the balance suspension leaf spring seat and the U-bolt,which is thick and easy to produce defects like shrinkage and porosity in the production process.In the structure,this position is the balance suspension leaf spring seat under the greatest stress position and a dangerous section of the part.

关 键 词：平衡悬架钢板弹簧座 失效分析 弯曲疲劳 危险截面 

分 类 号：U465[一般工业技术—材料科学与工程]