| 单峰过载下的疲劳裂纹扩展厚度效应研究 |
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| 引用本文： | 高雅丽,张诗捷,刘绍伦.单峰过载下的疲劳裂纹扩展厚度效应研究[J].航空学报,1997,18(2):153-156. |
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| 作者姓名： | 高雅丽 张诗捷 刘绍伦 |
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| 作者单位： | 北京航空材料研究所２５室 |
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| 摘 要： | 进行了国产2024-T 351 铝合金在单峰过载条件下试样厚度对疲劳裂纹扩展性能影响的试验和分析研究。结果表明: 试样厚度对裂纹扩展迟滞有明显的影响; J. B. Chang 模型中的过载截止比不是材料常数, 它还和疲劳裂纹扩展的应力状态、载荷序列及试样厚度等因素有关。厚试样有较大的过载截止比, 用J. B. Chang 模型进行疲劳裂纹扩展寿命预测时应采用相应试样厚度的过载截止比。
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| 关 键 词： | 铝合金 试样厚度 疲劳裂纹扩展 单峰过载 |
STUDIES OF EFFECT OF THICKNESS ON FATIGUE CRACK GROWTH UNDER SINGLE OVERLOADING CONDITIONS |
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| Gao Yali,Zhang Shijie,Liu Shaolun.STUDIES OF EFFECT OF THICKNESS ON FATIGUE CRACK GROWTH UNDER SINGLE OVERLOADING CONDITIONS[J].Acta Aeronautica et Astronautica Sinica,1997,18(2):153-156. |
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| Authors: | Gao Yali Zhang Shijie Liu Shaolun |
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| Institution: | Beijing Institute of Aeronautical Materials, Beijing, 100095 |
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| Abstract: | Experimental and analytical studies of effect of specimen thickness on fatigue crack growth behavior were carried out in domestic 2024 T351 aluminum alloy. Fatigue crack growth tests were performed under single overloading conditions. The results showed that specimen thickness has significant effect on crack growth retardation, and overload shutoff ratio is not a material constant, which is also related to the stress state,loading and specimen thickness. Thick specimen has a larger overload shutoff ratio, and the overload shutoff ratios corresponding to specimen thickness should be used to predict the fatigue crack growth life by J.B.Chang model. |
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| Keywords: | aluminum alloy specimen thickness fatigue crack growth single overloading |
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