Abstract：As to the sonic fatigue problem of an aero-engine combustor liner structure, an effective method for predicting the fatigue life of a structure under random loadings is studied. Firstly, the probability distribution of Von Mises Stress of thin-walled structure under random loadings is studied, as a result, the representation of the peak stress probability density is given here. Based on the Miner linear theory, the method for predicting the random sonic fatigue life based on the stress probability density and power spectrum density is proposed, and the modal for fatigue life prediction is constructed. As an example, an aero-engine combustor liner structure is considered. Based on the random sonic fatigue stress is calculated by using the coupled FEM and BEM method, the fatigue life is estimated by using the constructed modal. And considering the influence of the wide frequency band, the calculated results are modified. The results show that, the methods presented in this paper are practical for the random fatigue life analysis of the aeronautical thin-walled structures.
沙云东;郭小鹏;张 军. 基于应力概率密度和功率谱密度法的随机声疲劳寿命预估方法研究[J]. , 2010, 29(1): 162-165.
Sha Yundong;Guo Xiaopeng;Zhang jun . Research on the random sonic fatigue life prediction based on the stress probability density and power spectrum density method.. , 2010, 29(1): 162-165.
2010, Vol. 29 
