Evaluation of fatigue, oxidation and creep damages on thermo-mechanical fatigue life for cylinder heads

Document Type : Research Article

Author

Department of Mechanical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran

Abstract

Due to the complex geometry and thermo-mechanical loading, cylinder heads are the most challenging parts of engines since they must endure cyclic thermo-mechanical stresses throughout their lifetime. This paper performed thermo-mechanical fatigue (TMF) life analysis of the cylinder heads using finite element method (FEM) and ANSYS software to predict the temperature and stresses and then TMF fatigue life using Sehitoglu theory and FEMFAT software. Elastic and plastic properties of cylinder heads obtained by low cycle fatigue (LCF) tests at different temperatures. LCF tests were simulated by ANSYS software, and excellent agreement was observed between the experimental and simulation results of LCF tests. The finite element analysis (FEA) results showed that the maximum temperature and stress values in the cylinder head are 208.6°C and 89.475 MPa at the valve bridge between exhaust valves. The maximum mechanical, oxidation, and creep damage values were determined as 6.45*10-6, 2.27*10-6, and 3.44*10-7, respectively. The obtained TMF results proved that mechanical damage plays a leading role in the total TMF life of the cylinder head. According to the numerical results, creep damage is negligible.

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AUT Journal of Mechanical Engineering
Volume 9, Issue 3
In Progress
July 2025

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