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Journal of Vibration Testing and System Dynamics 9(3) (2025) 209--220 | DOI:10.5890/JVTSD.2025.09.001

Xin Xiong$^{1,2}$, Zhong Luo$^{1, 2, 3}$, Bao-Long Shi$^{1,3}$, Yong-Heng Luo$^{1,3}$

$^{1}$ School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, PR China

$^{2}$ Foshan Graduate School of Northeastern University, Foshan 528312, PR China

$^{3}$ Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education, Northeastern University, Shenyang 110819, PR China

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Abstract

The complex structural characteristics of the automobile engine cylinder head and the harsh working environment make the thermal-mechanical fatigue damage of the cylinder head particularly prominent. In this paper, the cylinder head of automobile engine is taken as the research object, and the finite element model of cylinder head-gasket-cylinder block is established based on workbench software. The fluid dynamics analysis (CFD) and multi-field coupling analysis are carried out. The influence of bolt preload, gas pressure and temperature field load on cylinder head stress is compared and analyzed, and the fatigue life of cylinder head under thermal load-mechanical load coupling is evaluated. The results show that the temperature field load has the most significant influence on the cylinder head stress, accounting for 50\% $\mathrm{\sim}$ 80\% of the total load. Under the thermo-mechanical coupling, the temperature gradient between the exhaust zone and the intake zone is high, the safety factor is low, and fatigue failure is prone to occur.

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