用假设检验观点考虑经验因素时疲劳寿命分散系数研究

传统的疲劳寿命分散系数的理论值是基于参数估计概念得出的，由于仅利用本次产品样本试验数据而使其数值，尤其对航空宇航一类结构而言，与实际统计值相比往往偏大；考虑实际产品的继承性，从假设检验观点出发，强调充分利用以往的信息，推导了基于假设检验观点的疲劳寿命分散系数，并讨论了某些参数的影响。通过算例表明与传统的参数估计概念的分散系数相比，假设检验观点的分散系数更趋近于实际统计值。

The Research on the Scatter Factor of Fatigue Life Based on the Concept of Hypothesis Test

Because of only considering the data of the present sample tests, traditionally the scatter fac-tor of fatigue life Sf based on the concept of parameter estimation is often much larger than the actual sta-tistical value, especially for the aeronautical and astronautical structures. By considering the succession ofpractical products and emphasizing to make full use of the data of the previous sample tests, we deduce thescatter factor of fatigue life S based on the idea of hypothesis test and discuss the influence of some pa-rameters in this paper. Compared with the Sf obtained from the concept of parameter estimation, the Sbased on the idea of hypothesis test is'much colser to the actual statistical value.