| 疲劳S-N曲线的加权最小二乘法拟合 |
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| 引用本文： | 吉凤贤,姚卫星.疲劳S-N曲线的加权最小二乘法拟合[J].南京航空航天大学学报(英文版),2004,21(1):53-57. |
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| 作者姓名： | 吉凤贤 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： | 中国博士点基金 (2 0 0 2 0 2 870 2 2 )资助项目，航空科学基金 ((0 3 A5 2 0 0 5 ) )资助项目~~ |
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| 摘 要： | 提出了一种拟合材料疲劳S—N曲线的加权最小二乘法，各应力水平下的拟合点的权重反比于均值置信区间的长度。两个算例结果表明：本方法较好地考虑了S—N曲线分散性的物理特性。
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| 关 键 词： | S-N曲线 分散性 加权最小二乘法拟合 材料测试 疲劳测试 |
WEIGHTED LEAST SQUARE METHOD FOR S-N CURVE FITTING |
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| JI Feng-xian,YAO Wei-xing.WEIGHTED LEAST SQUARE METHOD FOR S-N CURVE FITTING[J].Transactions of Nanjing University of Aeronautics & Astronautics,2004,21(1):53-57. |
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| Authors: | JI Feng-xian YAO Wei-xing |
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| Abstract: | An S-N curve fitting approach is proposed based on the weighted least square method, and the weights are inversely proportional to the length of mean confidence intervals of experimental data sets. The assumption coincides with the physical characteristics of the fatigue life scatter. Two examples demonstrate the method. It is shown that the method has better accuracy and reasonableness compared with the usual least square method. |
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| Keywords: | fatigue test S-N curve weighted least square method confidence interval |
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