| 汽车转向拉杆断裂失效分析 |
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| 引用本文： | 丁大伟,徐学东,姜公锋,张亦良. 汽车转向拉杆断裂失效分析[J]. 失效分析与预防, 2008, 3(4): 28-32 |
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| 作者姓名： | 丁大伟 徐学东 姜公锋 张亦良 |
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| 作者单位： | 北京工业大学,固体微结构与性能研究所,北京,100022;北京工业大学,机械与微电子应用学院,北京,100022 |
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| 基金项目： | 北京工业大学校科研和教改项目 |
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| 摘 要： | 某车辆在一次轮侧碰撞事故中，其转向拉杆在与梯形臂连接的螺纹处发生断裂。通过宏观检查、化学成分分析、显微组织分析、断口扫描电镜分析以及建立其力学模型进行稳定计算并综合分析后认为，该拉杆具有早期缺陷。很大程度上降低了其安全系数。在有缺陷的情况下，横拉杆的稳定极限载荷为24．41kN，承载能力较其正常稳定极限载荷50．23kN下降了51．4％。该转向拉杆在此次事故中受到冲击载荷，在横截面积最小处即连接螺纹处发生失稳，最终断裂失效。
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| 关 键 词： | 转向拉杆 失效分析 早期缺陷 失稳 |
Fracture Failure Analysis of an Automobile Steering Tie Rod |
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| DING Da-wei,XU Xue-dong,JIANG Gong-feng,ZHANG Yi-liang. Fracture Failure Analysis of an Automobile Steering Tie Rod[J]. Failure Analysis and Prevention, 2008, 3(4): 28-32 |
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| Authors: | DING Da-wei XU Xue-dong JIANG Gong-feng ZHANG Yi-liang |
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| Affiliation: | DING Da-wei, XU Xue-dong, JIANG Gong-feng, ZHANG Yi-liang (1. Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100022, China; 2. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Bering 100022, China) |
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| Abstract: | An automotive steering tie rod fractured in a collision accident. Macro examination, chemical composition analysis, microstrueture examination, and fracture surface analysis by SEM were carried out on the fractured steering tie rod. In addition, a mechanical model was established, and the stability analysis calculation was carried out according to the model. The results showed that there were early defects in the steering rod, and as a result, the safety coefficient of the steering rod greatly declined. The ultimate beating capacity of the defective steering rod was 24.41kN, declining by 51.4% , compared with the normal ultimate beating capacity of 50.23kN. In this accident, the defective steering rod was acted on by impact load, and eventually, it fractured at the point under the effect of greatest pressure. |
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| Keywords: | steering tie rod failure analysis early defects instability |
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