Automotive Science and Engineering

en Evaluation of quenching process on low cycle fatigue life for cylinder head موتور احتراق داخلی Internal Combustion Engines (ICE, ...) پژوهشي Research Due to the complex geometry and thermos-mechanical loading, cylinder heads are the most challenging parts among all parts engines. They must endure cyclic thermal and mechanical loading throughout their lifetime. Cast aluminum alloys are normally quenched after solution treatment process to improve aging responses. Rapid quenching can lead to high residual stress. Residual stress is one of the main reasons for failure of cylinder heads. The effect of residual stress on the thermal stress and low cycle fatigue life (LCF) of cylinder heads was studied. For this goal, Solidworks software was used to model the cylinder heads. Then the thermo-mechanical analysis was performed to determine the temperature and stress field in ANSYS software.  Finally, the fatigue life analysis that considers residual stress effect was done. The results of finite element analysis (FEA) proved that the effect of residual stress in LCF is significant which is not negligible. Thus, residual stress must be considered in the thermo-mechanical fatigue analysis of the engines cylinder heads. The numerical results showed that the area where the maximum temperature and stress is occurred is where the least LCF is predicted.   Low cycle fatigue life Finite element analysis Engines cylinder heads Quenching process 3971 3979 http://ase.iust.ac.ir/browse.php?a_code=A-10-147-11&slc_lang=en&sid=1 Hojjat Ashouri ashouri1394@gmial.com 180031947532846004233 180031947532846004233 Yes Department of Mechanical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran