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Thermo-Mechanical Fatigue Life Prediction of Heavy Duty Diesel Engine Cylinder Heads

[+] Author Affiliations
Xuyang Guo, Ying Cheng

Beijing Institute of Technology, Beijing, China

Ziming Zhang

China North Engine Research Institute, Tianjin, China

Paper No. IMECE2013-62385, pp. V015T12A010; 8 pages
doi:10.1115/IMECE2013-62385
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 15: Safety, Reliability and Risk; Virtual Podium (Posters)
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5644-4
  • Copyright © 2013 by ASME

abstract

Due to the complex geometry and loading conditions, cylinder head is the most challenging part among all components in heavy duty diesel engines. It experiences both severe thermal loads and mechanical loads, resulting thermal fatigue, mechanical fatigue and thermo-mechanical fatigue (TMF). The demands for higher power and lower emissoins and fuel consumption accelerate fatigue.

In this paper, a life time prediction process is presented with emphasis on analyses of multiaxial stress state and fatigue life assessment models in critical areas. The specimen test is used to obtain the material properties. The influences of thermal and mechanical loads on the critical areas are investigated. In addition, different fatigue life models are applied to estimate fatigue life of a heavy duty diesel engine cylinder head. It is proved that both the crack locations and life time are predicted with high accuracy.

Copyright © 2013 by ASME

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