摘要
1.可靠度与寿命分布分散系数 先考虑固定试验条件下的寿命分散,将疲劳寿命T这一随机变量的概率分布函数记为F(t),其密度函数为f(t),那么在某个时刻t_R,结构可靠度(即存活概率)
According to Chinese military specification a suitable fatigue life scatter factor must be used in determining aircraft safe life from fatigue test life. The relationship between the reliability and the life distribution scatter factor has been discussed. The difference between the life distribution scatter factor and the specification life scatter factor has been pointed out. The concept of spectrum variation factor has been emphasized. It is argued that the specification fatigue life scatter factor should be the product of the life distribution scatter factor and the spectrum variation factor. Determination of structure safe life from fatigue test results of used structures has also been considered. Two points are of significance: when converting used time to fatigue test life the time should be reduced instead of being increased, different specification fatigue life scatter factors should be chosen for service time and test time.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1991年第8期B443-B446,共4页
Acta Aeronautica et Astronautica Sinica
关键词
疲劳试验
疲劳寿命
可靠性
飞机
fatigue test, fatigue life, fatigue life scatter factor, reliability,
