Journal of South China University of Technology (Natural Science Edition) ›› 2018, Vol. 46 ›› Issue (3): 35-41.doi: 10.3969/j.issn.1000-565X.2018.03.006

• Mechanical Engineering • Previous Articles     Next Articles

Simulation Analysis on Mechanical Fatigue Life of
a Vehicle Exhaust System
 

 WU Jie LIANG Peicong   

  1.  School of Mechanical and Automobile Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
  • Received:2017-07-11 Revised:2017-12-07 Online:2018-03-25 Published:2018-03-01
  • Contact: 吴杰(1973-)，男，博士，副教授，主要从事不确定系统分析与优化、汽车振动与噪声研究 E-mail:wujie73@163.com
  • About author:吴杰(1973-)，男，博士，副教授，主要从事不确定系统分析与优化、汽车振动与噪声研究
  • Supported by:
     Supported by the New Century Talent Planning Project of the Ministry of Education(NCET-11-0157) and the Natural Science Foundation of Guangdong Province(2016A030313463) 

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Abstract: To effectively improve the accuracy of total life analysis， the finite element method is used to predict the fatigue durability of exhaust systems in this paper． A method of the wholelifespan analysis based on dynamic responses is proposed by combining the nominal stress method with dynamic fatigue analysis． The method applies modal frequency response analysis to calculate the stress response to the structure under different frequency excitation． Ｒegarding the stress response as fatigue loads， the fatigue life of the structure is calculated on the basis of the fatigue characteristics of the material and the Miner linear cumulative fatigue theory． Taking a car exhaust system for the research object， its mechanical fatigue life under engine torque excitation and vibration excitation are analyzed． The simulation results show that the durability of the exhaust system meet the requirements． 

Key words: exhaust systems, dynamic responds, fatigue analysis, vibration durability

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