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Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution

查看全文 作　　者：SHA Yun-[1]dong;GUO Xiao-[2]peng;LIAO Lian-[2]fang;XIE Li-[2]juan 高影响力作者 机构地区：[1]Liaoning Key Laboratory of Digital Technology Simulation and Test Technique, College of Power and Energy Engineering, Shenyang Aerospace University, Shenyang 110136, China;[2]Shenyang Aeroengine Research Institute,Aviation Industry Corporation of China, Shenyang 110015, China高影响力机构 出　　处：《航空动力学报》索引2011年第26卷第4期,共8页高影响力期刊 基　　金：Supported by the National Aviation Fundamental Science Foundation of China(No.02C54007) 摘　　要：As to the sonic fatigue problem of an aero-engine combustor liner structure under the random acoustic loadings,an effective method for predicting the fatigue life of a structure under random loadings was studied.Firstly,the probability distribution of Von Mises stress of thin-walled structure under random loadings was studied,analysis suggested that probability density function of Von Mises stress process accord approximately with two-parameter Weibull distribution.The formula for calculating Weibull parameters were given.Based on the Miner linear theory,the method for predicting the random sonic fatigue life based on the stress probability density was developed,and the model for fatigue life prediction was constructed.As an example,an aero-engine combustor liner structure was considered.The power spectrum density(PSD) of the vibrational stress response was calculated by using the coupled FEM/BEM(finite element method/boundary element method) model,the fatigue life was estimated by using the constructed model.And considering the influence of the wide frequency band,the calculated results were modified.Comparetive analysis shows that the estimated results of sonic fatigue of the combustor liner structure by using Weibull distribution of Von Mises stress are more conservative than using Dirlik distribution to some extend.The results show that the methods presented in this paper are practical for the random fatigue life analysis of the aeronautical thin-walled structures. 关 键 词：thin-walled structure sonic fatigue life estimation probability density function(PDF) power spectrum density(PSD)
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