中文摘要：

研究了基于Birnbaum-Saunders（B-S）分布的可靠疲劳寿命分析及评估方法,建立了基于中位值和平均值的B-S分布寿命分散系数确定方法.并针对特殊试验数据情形,建立了基于最大和最小顺序统计量的B-S分布寿命分散系数确定方法.公式表明：随着B-S分布尺度参数的增大,其中位寿命分散系数与平均寿命分散系数递减,而最大与最小寿命分散系数不变.案例计算结果表明,B-S分布的寿命分散系数通常小于对数正态分布的寿命分散系数.

英文摘要：

A method for reliable fatigue life analysis and assessment based on BirnbaumSaunders（B-S）distribution was studied,and life scatter factor formulas of B-S distribution based on median value and mean value was derived respectively.Then,for some special cases of test data,life scatter factor formulas of B-S distribution based on the maximum and minimum order statistics was established.Formulas show that,the median and mean life scatter factors are decreased with the increasing of the scale parameter of B-S distribution,and the maximum and the minimum life scatter factors are constant.Case calculation results show that life scatter factors of B-S distribution are usually less than that of the lognormal distribution＇s.