| 铝合金前臂断裂失效分析 |
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| 引用本文： | 朱 姣,杨 春,钟振前,司 红.铝合金前臂断裂失效分析[J].物理测试,2020,38(5):14. |
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| 作者姓名： | 朱 姣 杨 春 钟振前 司 红 |
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| 作者单位： | 国家钢铁材料测试中心， 北京 100081 |
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| 摘 要： | 某表面镀铜的铝合金前臂连接杆受单向下压应力作用，使用3个月后发生开裂，通过化学成分分析、宏观及微观断口分析、高倍金相检验、力学性能试验、显微硬度测定等方法对铝合金杆断裂原因进行了综合分析，结果表明：铝合金杆是弯曲应力作用下的疲劳断裂，疲劳从表面线性起裂，镀铜前材料本身存在裂纹缺陷，镀铜进一步渗入基体材料，工作中铝合金杆受到了单向应力进而加速导致疲劳开裂。
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| 关 键 词： | 铝合金杆 裂纹缺陷 疲劳断裂 |
| 收稿时间： | 2019-09-02 |
Fracture failure analysis of aluminum alloy forearm |
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| ZHU Jiao,YANG Chun,ZHONG Zhen-qian,SI Hong.Fracture failure analysis of aluminum alloy forearm[J].Physics Examination and Testing,2020,38(5):14. |
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| Authors: | ZHU Jiao YANG Chun ZHONG Zhen-qian SI Hong |
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| Affiliation: | National Analysis Center for Iron and Steel， Beijing 100081， China |
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| Abstract: | One aluminum alloy forearm connecting rod with surface copper plating cracked after suffering unidirectional down stress for three months. The fracture reasons of aluminum alloy rod were comprehensively analyzed by means of chemical composition analysis, macroscopic and microscopic fracture analysis, high-magnification metallographic examination, mechanical property test, and microhardness measurement. The results showed that the aluminum alloy rod cracked due to the fatigue breakage under bending stress. Fatigue cracked linearly from the surface. The material itself had crack defects before copper plating, and the copper plating further penetrated into the substrate material. The unidirectional stress in work further accelerated and caused fatigue cracking. |
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