CUMULATIVE FATIGUE DAMAGE DYNAMIC INTERFERENCE STATISTICAL-MODEL

After studying in depth the statistical characteristics of cumulative fatigue damage D(t) and its critical value D-c, a new dynamic interfer ence statistical model for fatigue reliability analysis is presented i n this paper. Because the non-linearity of fatigue damage accumulation has been taken into account, this model is able to predict the fatigu e reliability for random spectrum loading. To verify the predicted res ults, two fatigue experiments were conducted in which the numbers of s pecimens were more than 100, using fighter spectrum loading (FALSTAFF spectrum) and constant-amplitude loading respectively. It is shown tha t the new model is reliable, practicable and better than existing mode ls.