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

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	Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution
其他题名	Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution
	SHA Yundong 1; GUO Xiaopeng 2; LIAO Lianfang 2; XIE Lijuan 2
	2011
发表期刊	航空动力学报
ISSN	1000-8055
卷号	26.0 期号:004 页码:727-734
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.
其他摘要	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)
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:4290431
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/143407
专题	中国科学院金属研究所
作者单位	1.College of Power and Energy Engineering,Shenyang Aerospace University 2.中国科学院金属研究所
推荐引用方式 GB/T 7714	SHA Yundong,GUO Xiaopeng,LIAO Lianfang,et al. Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution[J]. 航空动力学报,2011,26.0(004):727-734.
APA	SHA Yundong,GUO Xiaopeng,LIAO Lianfang,&XIE Lijuan.(2011).Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution.航空动力学报,26.0(004),727-734.
MLA	SHA Yundong,et al."Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution".航空动力学报 26.0.004(2011):727-734.