نوع مقاله : مقاله پژوهشی
نویسنده
Department of Mechanical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
Nowadays the exhaust manifolds are subjected to higher thermal stress than before, due to the increasing engine power output, fuel consumption and gas emission. Thus, simulation and analysis of fatigue cracks is essential. In this paper, thermo-mechanical fatigue (TMF) life analysis of the exhaust manifold is performed by using finite element method (FEM) and ABAQUS software to predict the temperature and stresses and then TMF fatigue life by using Sehitoglu theory and FEMFAT software. Mechanical properties of High silicon molybdenum (HiSiMo) ductile cast irons (DCI) obtained by LCF and tensile tests at different temperatures. The results of finite element analysis (FEA) proved that the confluence region withstands the maximum temperature and stress. The numerical results showed that the area where the maximum temperature and stress is occurred is where the least TMF life is estimated. The obtained TMF results proved that the mechanical damage plays a leading role in total TMF life of the exhaust manifold. The oxidation damage was greater than the creep damage which is not negligable.
کلیدواژهها [English]
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