| 1420铝锂合金的疲劳裂纹扩展和自抑制 |
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| 引用本文： | 李航月,孙海林.1420铝锂合金的疲劳裂纹扩展和自抑制[J].西安交通大学学报,1997,31(3):103-107. |
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| 作者姓名： | 李航月 孙海林 |
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| 作者单位： | 西安交通大学 |
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| 摘 要： | 研究了１４２０铝锂合金在２种不同应力比（０．１和０．７）下的疲劳长裂纹扩展特性和闭合效应，测量了裂纹扩展的门槛值和闭合力．虽然１４２０合金具有较低的本征门槛值，然而在低应力比下却呈现出优良的疲劳裂纹扩展特性，表现在低应力比下较高的疲劳门槛值和近门槛区裂纹扩展的自抑制．从实验的角度探讨了该合金“自抑制”现象产生的原因，指出这种作用主要来源于外韧化作用，包括分层韧化作用和晶体学扩展路径导致的高的裂纹闭合效应
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| 关 键 词： | 铝锂合金 疲劳裂纹 门槛值 裂纹闭合 |
Fatigue Crack Propagation and Restraintin a 1420 Aluminum Lithium Alloy |
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| Li,Hangyue,Sun,Hailin,Tao,Zhongming,Hu,Naisai,He,Jiawen.Fatigue Crack Propagation and Restraintin a 1420 Aluminum Lithium Alloy[J].Journal of Xi'an Jiaotong University,1997,31(3):103-107. |
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| Authors: | Li Hangyue Sun Hailin Tao Zhongming Hu Naisai He Jiawen |
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| Abstract: | The long crack propagation properties for a Russian aluminum lithium alloy (1420) were investigated at a stress ratio of 0 1. The tests at the stress ratio of 0 7 were also carried out in order to obtain the growth rates and effective intensity factor range relation and the intrinsic threshold of the material. The closure levels were measured near threshold region with a compliance technique. The mechanism of crack restraint near threshold and closure effect were discussed. |
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| Keywords: | Al Li alloy fatigue crack threshold crack clousure |
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