A Statistically Load-weighted Probabilistic Fatigue Life Model
By interpreting traditional stress-strength interference model as a statistical average of theprobability that strength (a random variable) is greater than stress (another random variable) over itswhole distribution range,the same model configuration,which was conventionally applied only tothe case of same system-of-units parameters (e.g.,stress and strength,both are measured in Mpa),was applied to more general situation of different system-of-units parameters.That is to say,thetraditional model was extended to more general situations of any two variables,as long as one of thevariables can be expressed as a function of the other.Further more,the probabilistic fatigue lifeunder random stress can be predicted,with known probabilistic fatigue lives under severaldeterministic cyclic stress amplitudes and known distribution of the random cyclic stress amplitude.The underlying principle is that the fatigue life under random stress is equal to the statistical averageof the fatigue lives under cyclic stress of deterministic amplitudes which can be considered as thesamples of the random stress.
Fatigue life Failure probability Stress amplitude distribution Life distribution,Statistical average arithmetic
L.Y.Xie W.Q.Lin
Northeastern University,Shenyang,11004,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）