Abstract: This paper points out that there are two kisds of factor, transverse distributions influence factor and longitidinal distributions influence factor, effecting fatigue stress distribution. Different reliability calculation model should be adopted when different influence factors exist. This paper presents a reliability calculation model, Synthetic method of Miner's rule and interference model, for the situation which both of the influence factors exist. An example is given for calculating the reliability of element under complex loads by using this method.

Key words: Fatigue, Reliability, Stress distribution Calculation model