| 短裂纹的裂纹尺寸分布密度函数与耐久性设计 |
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| 引用本文： | 徐灏,王维明,吴志学.短裂纹的裂纹尺寸分布密度函数与耐久性设计[J].航空学报,1995,16(5):605-608. |
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| 作者姓名： | 徐灏 王维明 吴志学 |
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| 作者单位： | 东北大学机械工程学院!沈阳，110006，东北大学机械工程学院!沈阳，110006，东北大学机械工程学院!沈阳，110006 |
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| 摘 要： | 给出了一个极为简单的近似方法, 只要依据亚音速机翼在t-= 0 时的f Ej i ( 0) 和t-= ts 时的 f Eij ( t-s) 值即可求得非定常空气动力系数的两个主导极点值, 避免了必须先计算出机翼的任一个气 动力系数指数函数, 然后经过拟合才能求出两个主导极点值的繁琐作法。 关键词 非定常流, 机翼, 气动力系数, 指数函数.
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| 关 键 词： | 孔边裂纹 裂纹尺寸分布 耐久性设计 |
THE PROBABILISTIC DENSITY FUNCTION OF SHORT CRACK SIZE FOR DURABILITY DESIGN |
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| Xu Hao,Wang Weiming,Wu Zhixue.THE PROBABILISTIC DENSITY FUNCTION OF SHORT CRACK SIZE FOR DURABILITY DESIGN[J].Acta Aeronautica et Astronautica Sinica,1995,16(5):605-608. |
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| Authors: | Xu Hao Wang Weiming Wu Zhixue |
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| Institution: | Mechanical Engineering Institute of Northeastern University,Shenyang,110006 |
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| Abstract: | Through fatigue experiments, the growth law of short cracks both on the surface of smooth steel 45 specimens and on the edge of holed steel 16Mn specimens was obtained. The relation of short crack growth rate with stress level and crack size was established. From the test data of the holed specimen of steel 16Mn, the distrbution of the short crack size is found to be logarithm normal. The evolution of the probabilistic density function of short crack sizes is studied, and the results show that it is consistent with the crack size evolution in durability design. |
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| Keywords: | crack around hole crack size distribution durability design |
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