| 高速列车用高强铝合金疲劳断口的特征 |
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| 引用本文： | 丁 波,杨尚磊,白建颖,倪维源,贾 进.高速列车用高强铝合金疲劳断口的特征[J].上海工程技术大学学报,2014(1):1-5. |
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| 作者姓名： | 丁 波 杨尚磊 白建颖 倪维源 贾 进 |
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| 作者单位： | 上海工程技术大学材料工程学院,上海201620 |
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| 基金项目： | 上海市教委科研创新重点资助项目（1188177） |
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| 摘 要： | 通过宏观拍照和扫描电镜对A7N01高强铝合金T型焊接接头的疲劳断口进行了研究,揭示了该铝合金疲劳裂纹萌生与扩展的特征.铝合金的疲劳断口可明显划分为疲劳裂纹源区、裂纹稳定扩展区和瞬断区3大区域.疲劳裂纹从T型焊接接头的焊趾处萌生并向接头中心线扩展,疲劳裂纹扩展区可以观察到疲劳破坏的一些典型特征,瞬断区的断口形貌与拉伸断裂相似,形成不平坦的粗糙表面.
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| 关 键 词： | A7N01铝合金 T型焊接接头 疲劳 断口特征 |
Fatigue Fracture Characteristics of High Strength Aluminum Alloy for High-Speed Train |
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| DING Bo,YANG Shanglei,BAI Jianying,NI Weiyuan,JIA Jin.Fatigue Fracture Characteristics of High Strength Aluminum Alloy for High-Speed Train[J].Journal of Shanghai University of Engineering Science,2014(1):1-5. |
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| Authors: | DING Bo YANG Shanglei BAI Jianying NI Weiyuan JIA Jin |
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| Affiliation: | (College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China) |
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| Abstract: | Through macro photography and scanning electron, the fatigue fracture of T-welded joint of A7N01 high strength aluminum alloy was studied, the characteristics of crack initiation and growth were revealed. The fatigue fracture can be divided into three parts, namely, fatigue crack initiation zone, fatigue crack extension region and transient breaking region. The result shows that the fatigue crack initiated at the weld toe zone is propagating to the center line of the joint, some typical featuers of fatigue failure can be discovered in fatigue extension region, the fracture surface morphology of transient breaking region presents an uneven and rough surface,which is similar to that of tensile fracture. |
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| Keywords: | A7N01 aluminum alloy T-welded joint fatigue fracture characteristics |
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