Method of Life Prediction of Engine Cylinder Cover

Abstract:

Cylinder cover is an important component of the engine. It is damaged by low cycle thermal fatigue, high cycle thermal fatigue and creep in operation. Thus, the life and reliability of the cylinder cover are important criteria for engines. The temperature field and stress field of the cylinder cover are computed by the sequentially coupled analysis method: the elastic strain, plastic strain and creep strain of the dangerous point on the cylinder cover are analyzed in ten startup-working-shut down cycles; and it is proved in theory that low cycle thermal fatigue is the primary factor affecting the service life of the cylinder cover and the startup time of the engine is an appropriate parameter to estimate the life of thecylinder cover. The creep has little influence on the stress amplitude, and makes the mean stress increased. The relaxation is coexisting with creep in high temperature; it reduces the increase speed of mean stress. After finite cycles, the mean stress tends to constant gradually. Therefore, the creep-fatigue interaction can equal to thermo-mechanical fatigue whose stress amplitude and mean stress are constant. At last, the mean service life of cylinder is predicted.

• Periodical: Advanced Materials Research (Volume 677)
• Pages: 236-240
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.677.236
• Online since: March 2013
• Authors: Yu Sheng Wang, Wen Xuan Ma, Ming Li, Hao Jin
• Keywords: Creep, Cylinder Cover, Life Prediction, Thermal Fatigue

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