| 汽车螺栓断裂失效分析 |
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| 引用本文： | 王荣.汽车螺栓断裂失效分析[J].理化检验(物理分册),2005,41(9):471-474. |
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| 作者姓名： | 王荣 |
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| 作者单位： | 上海材料研究所,上海,200437 |
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| 摘 要： | 对汽车上某一连接发动机和车身的高强度级别螺栓在使用过程中发生的断裂进行了分析.结果表明,螺栓的化学成分和金相组织均正常,其断裂为多源疲劳断裂.经对螺栓使用过程中的受力情况分析,认为螺栓断裂主要是由于该螺栓在安装时预紧力不足或汽车在运行过程中,发动机自身振动和汽车行进中颠簸而使螺栓产生了松动,从而受到交变载荷而在应力集中最为严重的螺纹根部发生疲劳断裂.
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| 关 键 词： | 螺栓 断裂 疲劳 |
| 文章编号： | 1001-4012（2005）09-0471-04 |
| 收稿时间： | 2005-03-28 |
| 修稿时间： | 2005-03-28 |
FRACTURE ANALYSIS OF BOLT FOR CAR |
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| WANG Rong.FRACTURE ANALYSIS OF BOLT FOR CAR[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2005,41(9):471-474. |
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| Authors: | WANG Rong |
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| Affiliation: | Shanghai Research Institute of Materials, Shanghai 200437, China |
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| Abstract: | The high strength bolt fastening motor and automobile body was broken in survice. The analysis showed that the chemical composition and microstructure were in normal state. But the fracture revealed fatigue characteristic. Finally, the force acting on bolt were analyzed, the results showed that the bolt were fatigue fracture occurred in the root of bolt at which suffering alternation stress and stress concentration, which resulted from the motor body vibration and bump resulting in a bit more loose from lacking of enough pre-force in bolt assembling. |
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| Keywords: | Bolt Fracture Fatigue |
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