使用载荷下的重谱能降低寿命不能降低疲劳分散系数
收稿日期: 2012-10-11
修回日期: 2013-01-04
网络出版日期: 2013-03-04
Heavy Spectra Under Operational Loads May Reduce Life But Not Fatigue Scatter Factor
Received date: 2012-10-11
Revised date: 2013-01-04
Online published: 2013-03-04
张福泽 . 使用载荷下的重谱能降低寿命不能降低疲劳分散系数[J]. 航空学报, 2013 , 34(8) : 1892 -1897 . DOI: 10.7527/S1000-6893.2013.0066
Based on research on the relationship between test stress and distribution of fatigue scatter factor, this paper concludes that heavy spectra with high damage under operational loads may reduce the life but not the fatigue scatter factor. This conclusion contradicts with the Aircraft Structural Strength Specifications published in China in 2010, which states that a fatigue scatter factor of half that for the mean spectra can be selected for heavy spectra (i.e. 2 instead of 4). To verify the conclusion of this paper, test data of heavy spectra and mean spectra under operational loads with 5 simulated items of different materials and structures are found and used and they all bear witness to its correctness.
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