| 8090铝锂合金疲劳裂纹扩展行为与裂纹闭合效应 |
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| 引用本文： | 陈铮.8090铝锂合金疲劳裂纹扩展行为与裂纹闭合效应[J].宇航学报,1991(2):59-63. |
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| 作者姓名： | 陈铮 |
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| 作者单位： | 西北工业大学 |
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| 摘 要： | 采用CT试样研究了8090铝锂合金疲劳裂纹扩展行为与裂纹闭合效应。根据da/dN、k_(op)、⊿k_((?)ff)、⊿k_((?)ff)/⊿k与⊿k的关系,提出了裂纹扩展机制,发现在不同阶段裂纹扩展行为的差异系因闭合效应的变化,裂尖后方的闭合长度对裂纹扩展行为有重大影响。
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| 关 键 词： | 铝锂合金 疲劳 裂纹 裂纹闭合 |
GROWTH BEHAVIOR OF FATIGUE CRACKS AND CRACK CLOSURE EFFECT IN 8090 ALUMINIUM-LITHIUM ALLOY |
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| Chen Zheng.GROWTH BEHAVIOR OF FATIGUE CRACKS AND CRACK CLOSURE EFFECT IN 8090 ALUMINIUM-LITHIUM ALLOY[J].Journal of Astronautics,1991(2):59-63. |
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| Authors: | Chen Zheng |
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| Institution: | Northwestern Polytechnical University |
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| Abstract: | The growth and closure characteristics of fatigue cracks were studied by using CT type specimens in 8090 Aluminium-Lithium alloy. The mechanisms of the growth behavior, kop, keff, keff/ k with k. It was founded that the differences in the behavior of crack growth in different stages came from the variation of their closure behavior. The closure length behind the crack tip has a great influence upon the crack growth behavior. |
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| Keywords: | Aluminium-Lithiam alloy Fatigue crack growth Crack closure Crack tip shielding Crack wake |
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