球头销断裂失效分析  

Failure Analysis of Bulb Pin

作　　者：李楠[1,2,3] 施睿[4] 刘德林[1,2,3] 

机构地区：[1]北京航空材料研究院,北京100095 [2]航空材料检测与评价北京市重点实验室,北京100095 [3]中航工业失效分析中心,北京100095 [4]中国北方车辆研究所,北京100072

出　　处：《失效分析与预防》2015年第2期112-117,共6页Failure Analysis and Prevention

摘　　要：特种车辆在恶劣环境下试车,发现连接转向节与下横臂的球头销发生开裂。对失效球头销外观及断口进行宏微观观察,并对材料金相组织、硬度、化学成分进行检查和分析,确定了球头销的开裂性质及失效原因。研究结果表明,球头销为双向弯曲疲劳开裂。球头销颈部无淬硬层,使得其疲劳抗力不足,是导致其疲劳开裂的原因之一;球头销转动不良,存在较大的阻力,使其颈部受力增大,是导致疲劳开裂的又一因素。After endurance testing of a vehicle, a bulk pin was found to have cracked. In this paper, macro and micro observation on the bulk pin were carried out. Hardness and chemical composition were tested. The results indicate that the crack of the bulk pin is bi-directional bending fatigue crack. The neck position of the pin did not have hardened layers, resulting in lower fatigue resistance. Another cause for the failure is that the pin couldn’ t rotate smoothly, which increased the applied force around the neck of the pin.

关 键 词：球头销 30CRMNSIA钢 疲劳断裂 热处理 粘着磨损 

分 类 号：U463.46[机械工程—车辆工程]