| 疲劳裂纹扩展的非平衡统计模型 |
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| 引用本文： | 胡海云,邢修三. 疲劳裂纹扩展的非平衡统计模型[J]. 北京理工大学学报(英文版), 2001, 10(3): 240-245 |
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| 作者姓名： | 胡海云 邢修三 |
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| 作者单位： | 北京理工大学应用物理系, |
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| 基金项目： | 教育部留学回国人员科研启动基金 |
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| 摘 要： | 为了研究金属中微观结构对疲劳短裂纹扩展性能的影响 ,在宏观与微观相结合的疲劳断裂非平衡统计理论中 ,考虑了材料微观结构因素 ,从而能够合理地解释有关疲劳短裂纹及长裂纹的实验结果 .建立的非平衡统计理论模型把位错机理同裂纹扩展联系起来进行模拟 ,得到了包括疲劳短裂纹及长裂纹的整个金属疲劳寿命内的普适裂纹扩展速率公式 ,并和他人的理论结果进行了比较 .
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| 关 键 词： | 疲劳短裂纹 疲劳长裂纹 涨落长大速率 非平衡统计理论 |
| 收稿时间： | 2000-07-11 |
Nonequilibrium Statistical Modeling of Fatigue Crack Growth Behaviour |
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| HU Hai yun and XING Xiu san. Nonequilibrium Statistical Modeling of Fatigue Crack Growth Behaviour[J]. Journal of Beijing Institute of Technology, 2001, 10(3): 240-245 |
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| Authors: | HU Hai yun and XING Xiu san |
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| Affiliation: | Dept. of Applied Physics, Beijing Institute of Technology, Beijing 100081, China;Dept. of Applied Physics, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | In order to study the influence of microstructural texture on the growth of short fatigue cracks in metals, the nonequilibrium statistical theory of fatigue fracture correlating a microscopic mechanism with the macroscopic properties is modified to take into consideration the microstructural features of a material, thereby allowing a rationalisation of the experimental data of short fatigue crack growth and long fatigue crack growth. The nonequilibrium statistical theory thus developed relates the growth of cracks with a dislocation mechanism to simulate short fatigue crack growth with the long fatigue crack growth behaviour and predicts the fatigue crack growth rates throughout the fatigue lifetime. The results is finally compared with that of other fatigue theories. |
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| Keywords: | short fatigue crack long fatigue crack fluctuation growth rate nonequilibrium statistical theory |
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