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Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution
| 题名： | Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution |
| 正文语种： | 中文 |
| 作者： | SHA Yun-dong GUO Xiao-peng LIAO Lian-fang XIE Li-juan |
| 作者单位： | Liaoning Key Laboratory of igital Technology Simulation and Test Technique, ollege of Power and Energy Engineering,Shenyang erospace University, Shenyang 110136, hina Shenyang eroengine Research Institute, viation Industry orporation of hina, Shenyang 110015 , hina |
| 关键词： | thin-walled structure sonic fatigue life estimation probability density function (PDF) power spectrum density (PSD) |
| 摘要： | As to the sonic fatigue problem of an acro-cngine combustor liner structure undcr the random a- coustic loadings,an cffective method for predicting the fatigue life of a structure undcr random loadings was studicd.Firstly,the probability distribution of Von Mises strcss of thin-wallcd structure undcr random loadings was studicd,analysis suggestcd that probability density function of Von Miscs stress proccss accord approximately with two-paramctcr Weibull distribution.The formula for calculating Weibull parameters were givcn.Based on the Miner linear theory,the method for predicting the random sonic fatigue life bascd on the stress probability dcnsity was developed,and the model for fatiguc life prediction was constructcd.As an cxamplc,an acro-cngine combustor lincr structure was considercd.The powcr spcctrum dcnsity (PSD) of the vibrational stress response was calculated by using the coupled FEM/BEM (finite clemcnt method/boundary elcmcnt mcthod) model,the fatiguc life was cstimated by using the constructed model.And considcring the influence of the wide frequency band,the calculated results were modified.Comparetive analysis shows that the es-timated results of sonic fatiguc of the combustor liner structure by using Weibull distribution of Von Mises strcss are more conservative than using Dirlik distribution to some extend.The rcsults show that the mcthods prcscntcd in this papcr are practical for the random fatigue life analysis of the acronautical thin-wallcd struc-turcs. |
| 会议日期： | 201306 |
| 会议举办地点： | 青岛 |
| 会议名称： | 2013年LMS中国用户大会 |
| 出版日期： | 2013-05-31 |
| 母体文献： | 2013年LMS中国用户大会论文集 |
| 分类号： | V232.6 V215.5 |
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