| 焊接接头低周疲劳损伤分形演化模型 |
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| 引用本文： | 邬华芝,郭海丁,高德平.焊接接头低周疲劳损伤分形演化模型[J].焊接学报,2003,24(1):88-90. |
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| 作者姓名： | 邬华芝 郭海丁 高德平 |
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| 作者单位： | 南京航空航天大学,动力工程系,南京,210016 |
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| 摘 要： | 用宏观与微观相结合的方法研究焊接接头疲劳损伤演变规律。认为焊接接头疲劳裂纹扩展路径在一定尺度范围内具有分形特征。用分形几何学方法建立裂纹扩展模型，将断裂力学的概念运用到损伤力学演化规律研究中，给出分形有效应力强度的表达式以及损伤演化率方程，推导出损伤演变方程，为从微观层次定量描述焊接结构疲劳断口特征及宏观疲劳断裂特性提供了一种新方法。
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| 关 键 词： | 焊接接头 疲劳损伤 分形模型 疲劳寿命 裂纹扩展模型 断裂力学 |
| 文章编号： | 0253-360X(2003)01-88-03 |
| 收稿时间： | 2002/5/22 0:00:00 |
Fractal damage evolution model of low-cycled fatigue in welded joint |
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| WU Hua-zhi,Guo Hai-ding and Gao De-ping.Fractal damage evolution model of low-cycled fatigue in welded joint[J].Transactions of The China Welding Institution,2003,24(1):88-90. |
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| Authors: | WU Hua-zhi Guo Hai-ding and Gao De-ping |
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| Affiliation: | Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China,Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China and Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | Based on the macroscale and microscale mechanics me- thod,a research on fatigue damage evolution of welded joint is conducted.The propagation trace of fatigue crack in welded joint is considered to be with a fractal characteristic within certain scale range.By use of fractal geometry theory,a model of fatigue crack propagation is established,in which the fracture mechanics theory is connected with fatigue damage evolution.An expression of fractal effective stress intensity and a equation of fatigue damage evolution are given.A new quantitative method is provided for describing the characteristics on fatigue crack surfaces of welded joint from microscale. |
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| Keywords: | welded joint fatigue damage fractal model |
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