| 拉扭加载下疲劳裂纹扩展的试验研究 |
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| 引用本文： | 王英玉,姚卫星.拉扭加载下疲劳裂纹扩展的试验研究[J].南京航空航天大学学报(英文版),2004,21(4). |
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| 作者姓名： | 王英玉 姚卫星 |
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| 作者单位： | 南京航空航天大学航空宇航学院,南京,210016,中国 |
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| 基金项目： | 国家教育部博士点基金(20020287022)资助项目，南京航空航天大学博士学位论文创新与创优基金(4003019001)资助项目。~~ |
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| 摘 要： | 对航空材料LY12CZ进行了多种比例和非比例拉扭双轴加载下的疲劳试验。采用弹塑性有限元方法对缺口孔边的应力应变进行了分析,探讨疲劳裂纹扩展方向与孔边各应力和应变分量之间的关系。比较分析结果与试验数据得出比例加载下,疲劳裂纹基本上在垂直于最大主应变方向扩展。45°及90°非比例加载下,疲劳裂纹沿着最大剪应变平面扩展。
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| 关 键 词： | 多轴疲劳 裂纹扩展 比例加载 非比例加载 |
EXPERIMENTAL INVESTIGATION ON FATIGUE CRACK PROPAGATION UNDER TENSION-TORSION LOADING |
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| WANG Ying-yu,YAO Wei-xing.EXPERIMENTAL INVESTIGATION ON FATIGUE CRACK PROPAGATION UNDER TENSION-TORSION LOADING[J].Transactions of Nanjing University of Aeronautics & Astronautics,2004,21(4). |
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| Authors: | WANG Ying-yu YAO Wei-xing |
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| Abstract: | Various proportional and nonproportional tension-torsion fatigue tests are conducted on aeronautical material-LY12CZ aluminum alloy. The stress and strain states under tension-torsion loading are analyzed by an elastic-plastic finite element method. The relation between the orientation of crack propagation and each stress and strain component is investigated. Analytical results are compared with experimental data. Results demonstrate that the fatigue cracks tend to be propagated perpendicular to the direction of the largest principle strains under proportional loading, and grow alone one of the maximum shear strain planes under 45° and 90° out-of-phase loadings. |
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| Keywords: | multi-axial fatigue crack propagation proportional loading non-proportional loading |
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