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

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.