| Determination of fatigue cracking direction in composite laminates |
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| 作者姓名： | 戴耀 郝贵祥 李永东 何家文 崔建国 李年 傅永辉 孙军 |
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| 作者单位： | [1]DepartmentofMechanicalEngineering,AcademyofArmoredForceEngineering,Beijing100072,China [2]DepartmentofMaterialsScienceandEngineering,Xi＇anJiaotongUniversity,Xi＇an710049,China |
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| 摘 要： | The interface plays the central role in the failure analysis of composite laminates, therefore, the interface material properties are taken as the independent parameters. A simple, universal and practicable criterion, i.e. a ratio criterion of strain energy release rate, is proposed to determine the growing direction of a fatigue crack in the composite laminates. The method of arbitrary lines, which is very effective to solve the problems with high gradient feature, is used to analyze the experimental results at the key moments when a crack kinks, turns into the interface, or bifurcates. An approximate method of computing the energy release rate is given. The fatigue fracture tests of composite laminates are carried out, and the numerical predictions of crack growing directions agree well with the experimental results. It is concluded that the methods suggested in this paper are effective to obtain the cracking history and the growing path of a fatigue crack in composite laminates.
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| 关 键 词： | 复合层压 疲劳 裂纹伸展 任意线 |
| 收稿时间： | 28 September 2004 |
| 修稿时间： | 25 December 2004 |
Determination of fatigue cracking direction in composite laminates |
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| Dai Yao , Hao Gui-xiang , Li Yong-dong , He Jia-wen , Cui Jian-guo , Li Nian , Fu Yong-hui and Sun Jun.Determination of fatigue cracking direction in composite laminates[J].Journal of Central South University of Technology,2005,12(3):255-258. |
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| Authors: | Dai Yao Hao Gui-xiang Li Yong-dong He Jia-wen Cui Jian-guo Li Nian Fu Yong-hui and Sun Jun |
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| Affiliation: | (1) Department of Mechanical Engineering, Academy of Armored Force Engineering, 100072 Beijing, China;(2) Department of Materials Science and Engineering, Xi’an Jiaotong University, 710049 Xi’an, China |
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| Abstract: | The interface plays the central role in the failure analysis of composite laminates, therefore, the interface material properties are taken as the independent parameters. A simple, universal and practicable criterion, i.e. a ratio criterion of strain energy release rate, is proposed to determine the growing direction of a fatigue crack in the composite laminates. The method of arbitrary lines, which is very effective to solve the problems with high gradient feature, is used to analyze the experimental results at the key moments when a crack kinks, turns into the interface,or bifurcates. An approximate method of computing the energy release rate is given. The fatigue fracture tests of composite laminates are carried out, and the numerical predictions of crack growing directions agree well with the experimental results. It is concluded that the methods suggested in this paper are effective to obtain the cracking history and the growing path of a fatigue crack in composite laminates. |
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| Keywords: | composite fatigue crack growth method of arbitrary lines |
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