Abstract: After studying in depth the statistical characteristics of fatigue cumulative damage D(t)and critical cumulative damage Dc,a new dynamic interference model for the damage statistical analysis and the fatigue reliability analysis is presented. Because of considering the nonlinear accumulation of fatigue damage,this model is able to conveniently predict the fa- tigue reliability for spectrum loading.Verioing predicted results by a special test under fighter spectrum loading,with specimens as many as 101 pieces,it is shown that the new model is rea- sonable and practical,and is better than other existing models.

Key words: cumulative damage, dynamic models, statistical analysis reliability analysis