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life estimation of Reinforced Concrete Members after Fire

Journal of Southwest Jiaotong University(English Edition) 2006年第1期14卷 79-82页

作者：徐泽晶宋玉普徐有邻 The State Key Laboratory of Coast and Offshore Engineering Dalian University of Technology Dalian 410000 China Henan Provincial Academy of Building Research Zhengzhou 450000 China The State Key Laboratory of Coast and Offshore Engineering Dalian University of Technology Dalian 410000 China China Academy of Building Research Beijing 100000 China

To solve the problem of life estimation of reinforced concrete （RC） members after fire, an analysis is made of the resistance of RC members after fire. On basis of the resistance, the life of RC members after fire is analyzed by using JC （Jukes and Cantor） method. Then the calculation models for the resistance and the life estimation of RC members after fire are put forward, and an example analysis proves their reliability and accuracy.

关键词： Fire RC members life estimation Resistance analysis

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维普期刊数据库

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

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航空动力学报 2011年第4期26卷 727-734页

作者： SHA Yun-dong GUO Xiao-peng LIAO Lian-fang XIE Li-juan Liaoning Key Laboratory of Digital Technology Simulation and Test Technique College of Power and Energy Engineering Shenyang Aerospace University Shenyang 110136 China Shenyang Aeroengine Research Institute Aviation Industry Corporation of China Shenyang 110015 China

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 ***,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 *** formula for calculating Weibull parameters were *** 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 *** an example,an aero-engine combustor liner structure was *** 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 *** considering the influence of the wide frequency band,the calculated results were *** 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 *** 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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维普期刊数据库

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Low-cycle fatigue lifetime estimation of Ti–6Al–4V welded joints by a continuum damage mechanics model

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Rare Metals 2016年第4期35卷 299-302页

作者： Hong-Yu Qi Xiao-Lei Zheng Xiao-Guang Yang School of Energy and Power Engineering Beihang University Beijing 100191 China

The low-cycle fatigue （LCF） behavior of directionally solidified nickel-based superalloy Ti-6A1-4V was studied under bare and electron beam welding condi- tions at room temperature. Results show that：（1） under the same test conditions, all the joints exhibit lower LCF lifetime than Ti-6A1-4V; （2） the failure of welded structures is mainly ascribed to the welding defect. A novel lifetime prediction methodology based on continuum damage mechanics is proposed to predict the lifetime of Ti-6A1-4V and its welded joints.

关键词： Electron beam welding Low-cycle fatigue life estimation Continuum damage mechanics

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维普期刊数据库

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FATIGUE AND lifeTIME estimation OF A HIGHLY STRESSED CENTRIFUGAL COMPRESSOR IMPELLER

FATIGUE AND LIFETIME ESTIMATION OF A HIGHLY STRESSED CENTRIF...

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第十八届全国疲劳与断裂学术会议

作者： Richard A.Adjei Weizhe Wang Nailong Zhao Yingzheng Liu Key Lab of the Education Ministry for Power Machinery and Engineering Shanghai Jiao Tong University Gas Turbine Research Institute Shanghai Jiao Tong University

Centrifugal compressors have established prominence in the field of turbocharging for automotive applications,due to their compact design,good performance,and high power-to-weight *** features have made them ideal power units of turbochargers,from small passenger cars up to heavy duty *** impeller is the core component which has an important influence on the reliability of centrifugal compressor *** cycle fatigue of rotating compressor components is a serious problem,causing substantial damage and high maintenance *** blades of turbocharger compressors operating with variable speed are exposed to extreme unsteady dynamic *** forces are caused by the stroke and the charging system of the engine,the gas inlet,and the nozzle guide *** general,lack of experimental and numerical data does not allow the definition of the exciting forces required in the design *** of the overall performance are usually achieved by the use of computational tools such as computational fluid dynamics（CFD）,which provide a detailed analysis of the flow ***,the design process is invariably comprised by stress limits,creep life,and other material limitations,resulting in a true multidisciplinary design *** study of impeller’s structural integrity and fatigue problem has important engineering application *** paper therefore investigates the fatigue and lifetime of a highly stressed compressor impeller.A tightly coupled fluid-structure interaction（FSI） is numerically calculated to analyze the high-cycle fatigue（HCF） failure of the impeller *** order to obtain the time dependent aerodynamic loads on the impeller blades,three-dimensional unsteady compressible viscous flow of the centrifugal compressor is simulated.A data interpolation technique is subsequently used to transfer the physical information from fluid meshes to structure *** free vibration mode and forced vibration response of the

关键词： high-cycle fatigue compressor impeller fluid-structure interaction forced vibration life estimation

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