Amirkabir University of Technology AUT Journal of Mechanical Engineering 2588-2937 9 3 2025 07 01 Evaluation of Fatigue, Oxidation and Creep Damages on Thermo-mechanical Fatigue Life for Cylinder Heads 281 294 5716 10.22060/ajme.2025.23540.6142 EN Hojjat Ashouri Department of Mechanical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran 0000-0002-0983-4795 Journal Article 2024 09 19 The objective of the present study was to analyze the cylinder heads' thermo-mechanical fatigue life. This investigation was done by employing the finite element method. Moreover, ANSYS software was also used to achieve temperature and stress predictions. The thermo-mechanical fatigue life was then examined using Sehitoglu theory and FEMFAT software. The cylinder head's elastic and plastic properties were acquired at various temperatures by low-cycle fatigue tests. Low-cycle fatigue tests were simulated by ANSYS software, and excellent agreement was observed between the experimental and simulation results low-cycle fatigue tests. According to the finite element analysis, 208.6°C and 89.475 MPa were the maximum temperatures and stresses in the cylinder head at the valve bridge, which is located betwixt exhaust valves. The thermo-mechanical fatigue life analysis showed 71.16%, 25.04%, and 3.79% for mechanical, oxidation, and creep damages, respectively. The thermo-mechanical fatigue results proved the significant impact of the mechanical damage on the cylinder head's total thermo-mechanical fatigue life. Moreover, the numerical results indicated the negligibility of the creep damage. https://ajme.aut.ac.ir/article_5716_fd4771e85e1f916f239624486bff502d.pdf