| 汽车发动机曲轴断裂分析 |
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| 引用本文： | 于笋,周秋菊,张维明.汽车发动机曲轴断裂分析[J].理化检验(物理分册),2005,41(1):29-31. |
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| 作者姓名： | 于笋 周秋菊 张维明 |
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| 作者单位： | 一汽解放大连柴油机分公司,大连,611021;中机浦发国际贸易有限公司,上海,200131 |
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| 摘 要： | 某6缸发动机曲轴在运行8910km时，第六曲拐颈断裂。对断裂曲轴进行了断口观察、化学成分复验、基体硬度和显微组织检验。结果表明，曲轴的拐颈断裂为扭转疲劳断裂，断裂疲劳源位于油道孔与倒圆角曲面交接处，此处的切削加工刀痕及金属损伤形成应力集中且处于最大主应力面上，因而引发扭转疲劳断裂。
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| 关 键 词： | 发动机曲轴 油孔倒角 金属损伤 扭转疲劳断裂 |
| 文章编号： | 1001-4012(2005)01-0029-03 |
FRACTURE ANALYSIS ON CRANK SHAFT OF ENGINE OF AUTOMOTIVE |
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| YU Sun,ZHOU Qiu-ju.FRACTURE ANALYSIS ON CRANK SHAFT OF ENGINE OF AUTOMOTIVE[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2005,41(1):29-31. |
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| Authors: | YU Sun ZHOU Qiu-ju |
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| Abstract: | The failure happened on the sixth pitman axis after the engining crank shaft ran 8 910km. The fractured crank shaft was analyzed by fractographic inspections, chemical analysis, hardness testing of matrix and metallographic examinations. The result showed that the crack initiated from the pitman radial axis is torsioned fatigue fracture. The original crack was located at the interface of the oil hole and the filleted angle on it(a cute connected curve), where stress concentration, due to the trace of cut-machining and metal injures, occurring on the main stress section, leaded to torsioned fatigue fracture. |
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| Keywords: | Engining crank shaft Filleted angle on oil hole Metal injures Torsioned fatigue fracture |
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