| 应力集中对2024铝合金高周疲劳寿命的影响 |
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| 引用本文： | 刘常升,李海雄,杨弥珺,陈岁元.应力集中对2024铝合金高周疲劳寿命的影响[J].东北大学学报(自然科学版),2012,33(4):517-520. |
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| 作者姓名： | 刘常升 李海雄 杨弥珺 陈岁元 |
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| 作者单位： | 东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳,110819 |
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| 基金项目： | 教育部创新团队发展计划项目 |
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| 摘 要： | 研究了2024铝合金常温下的高周疲劳性能,获得了2024铝合金在不同应力状态下的S-N曲线.分析了疲劳试样的断口形貌和裂纹萌生/扩展机理,以及疲劳试样的组织结构与疲劳性能之间的关系.结果表明,疲劳极限随着应力集中系数的增加而降低,当应力集中系数相同时,疲劳极限随着应力比的减小而降低;2024铝合金的疲劳断口以穿晶断裂为主;第二相颗粒起到了阻碍疲劳裂纹扩展的作用,使2024铝合金的高周疲劳强度得到了明显提高.
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| 关 键 词： | 铝合金 S-N曲线 应力集中 疲劳 断口 |
Effect of Stress Concentration on High Cycle Fatigue Life of 2024 Al Alloy |
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| LIU Chang-sheng,LI Hai-xiong,YANG Mi-jun,CHEN Sui-yuan.Effect of Stress Concentration on High Cycle Fatigue Life of 2024 Al Alloy[J].Journal of Northeastern University(Natural Science),2012,33(4):517-520. |
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| Authors: | LIU Chang-sheng LI Hai-xiong YANG Mi-jun CHEN Sui-yuan |
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| Institution: | (Key Laboratory of Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China.) |
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| Abstract: | The high cycle fatigue life of 2024 Al alloy was studied at room temperature,and the S-N curves of 2024 Al alloy were obtained under different stress states.The fracture morphology,the crack initiation/propagation mechanism,as well as the relationship between structure and fatigue performance of fatigue specimens were analyzed.The results showed that the fatigue limit decreases with increasing stress concentration coefficient,and the fatigue limit decreases with the stress ratio under the same stress concentration coefficient.The fatigue fracture of 2024 Al alloy is mainly transgranular fracture.The second phases play the role of restraining the propagation of fatigue crack,and improving obviously the high cycle fatigue strength of 2024 Al alloy. |
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| Keywords: | Al alloy S-N curve stress concentration fatigue fracture |
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