| 疲劳裂纹尖端塑性变形的研究 |
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| 引用本文： | 李晓延,许棠.疲劳裂纹尖端塑性变形的研究[J].南京航空航天大学学报,1994,26(5):701-704. |
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| 作者姓名： | 李晓延 许棠 |
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| 作者单位： | 南京航空航天大学动力工程系 |
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| 摘 要： | 采用弹塑性有限元方法研究了疲劳裂纹尖端的塑性区形状和尺寸以及加载与卸载过程中裂纹面形状的变化，通过比较相同条件下静态裂纹与疲劳裂纹面张开位移的差异，研究了疲劳裂纹尖端尾纹中残留塑性变形的形成，讨论了裂纹尖端尾纹中残留塑性变形对裂纹闭合现象的影响。
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| 关 键 词： | 有限元 疲劳 裂纹扩展 裂纹闭合 |
Study on Plastic Deformations at Fatigue Crack Tip |
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| Li Xiaoyan,Xu Tang,Fan Yinhe.Study on Plastic Deformations at Fatigue Crack Tip[J].Journal of Nanjing University of Aeronautics & Astronautics,1994,26(5):701-704. |
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| Authors: | Li Xiaoyan Xu Tang Fan Yinhe |
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| Abstract: | An elastic-plastic finite element simulation of growing fatigue crack is used to study the size and shape of the forward plastic zone at the crack tip and the changes of crack profile during loading and unloading of the fatigue cycle. The residual plastic deformation in the wake of the advancing crack tip is studied by comparison between the crack opening displacements of fatigue crack and stationary crack under the same maximum applied stress. The influence of residual plastic deformation in the wake of the growing crack on the phenomenon of crack closure is also discussed. |
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| Keywords: | finite element fatigue crack growth crack closure |
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