Thermal-Mechanical Fatigue Life Prediction of Diesel Engine Cylinder Head

Vehicle Engine ›› 2023, Vol. 0 ›› Issue (2) : 47-52.

ZENG Xiaochun¹,MIAO Ruigang¹,WEI Tao¹,JING Guoxi^2,3,ZHANG Zhinan⁴,GUO Rong⁵,SUN Shuai^2,3

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Abstract

The sub-model method and the Sehitoglu model were used to carry out a detailed thermo-mechanical fatigue life prediction research on the cylinder head of a supercharged diesel engine. The thermal boundaries of cylinder head temperature field analysis were provided by using in-cylinder combustion simulation analysis and water jacket cooling analysis. The coupled calculation and analysis method of FEA and CFD for the cooling water side made the calculation boundaries more accurate and reasonable. Based on the finite element method, the temperature and stress-strain characteristics of cylinder head under rated and idle conditions were calculated, and the stress-strain history of cylinder head under hot and cold alternating thermal shock test conditions was obtained by using the sub-model method and considering the material nonlinearity. The thermalmechanical fatigue damage and life of cylinder head were calculated by the Sehitoglu model and the results show that the minimum life area of cylinder head was located near the exhaust seat ring of the third cylinder fire surface with the life of 5 038 cycles. The calculated life is higher than the 5 000 cycles of light truck evaluation standard. In the thermal-mechanical fatigue damage, the oxidation damage dominated by temperature factor plays a leading role, the mechanical damage follows, and the creep damage contributes the least.

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cylinder head / thermal-mechanical fatigue / life prediction

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ZENG Xiaochun,MIAO Ruigang,WEI Tao,JING Guoxi,ZHANG ZhinanGUO Rong,SUN Shuai. Thermal-Mechanical Fatigue Life Prediction of Diesel Engine Cylinder Head[J]. Vehicle Engine. 2023, 0(2): 47-52