两个疲劳分散系数计算公式之间的关系的研究

RESEARCH ON RELATION BETWEEN TWO FORMULAE FOR CALCULATING THE FATIGUE SCATTER FACTORS

常见的计算疲劳分散系数的公式有:(1)Antilog和(2)Antilog。国内外有的文献认为公式(1)的缺点是未说明以何种置信度确定母体均值,主张在应用公式(1)之前先对母体均值进行区间估计。本文提出了安全疲劳寿命(或极限)直线的概念,指出两个公式实际上是该直线的两种不同表示形式,并导出了它们之间的等效变换关系,从而说明公式(1)也象(2)一样包含有母体均值置信度的信息。

The usual formulae for calculating the fatigue scatter factors are: (1) Antilog ( ) and (2) Antitog ( ). It is tbought that a disadvantage of formula (1) is that no statement can be made about the confidence with witch the population mean has been determined. Making an interval estimate of populatbn mean s suggested before applying formula (1) . Authors set up a concept of safe fatigue life (or limit) line, show that the two formulae are two different representative forms of the line in fact, and derive a equivalently trarsform formula from each into other. Therefore formula (1) contains as the information on the confidence as formula (2).