摘要
对抗侧滚扭杆系统在疲劳试验过程中出现的断裂现象进行了分析,低倍、金相、硬度检验结果可以判断该扭杆轴采用的原材料及热处理符合设计要求。分析了产生断裂的原因。原安装座结构扭矩过大及扭杆轴直径过渡处圆角尺寸偏小导致应力集中,使扭转轴台阶外表面产生局部凹陷区域形成最初裂源,在扭转弯曲组合力的反复作用下,最终导致扭杆轴断裂。对抗侧滚扭杆系统进行了结构优化,有限元分析与应力测试结果表明,优化后的结构更合理,且通过了1 000万次疲劳试验。
The fracture phenomenon in fatigue test process of the anti-roll torsion bar system is analyzed, results of macroscopic test, metallographic examinationand hardness testing prove that the raw and heat treatment system of the torsion bar could meet the design requirements. The local sag area on outside surface of the bar becomes the initial crack source, and the circulation work of the bend forceeventually leads to the torsion bar shaft fracture. So, the structure of torsion bar shall be optimized with finite el- ement analysis. The stress test result and finite element a- nalysis show that the improvedf structure is reasonable which has passed 10 million times of fatigue test.
出处
《城市轨道交通研究》
北大核心
2014年第1期86-90,共5页
Urban Mass Transit
关键词
抗侧滚扭杆
疲劳失效
结构优化
有限元分析
anti-roll torsion bar
fatigue failure
structuraloptimization
finite element analysis
