الفهرس 
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Abstract
In this study, 3-D finite element method on the SI engine piston is carried out for investigating thermal behavior and structure stress of uncoated and coated piston using Ansys software. Finite element thermal analysis is first applied to uncoated piston made of aluminum alloy as actual piston material. Then different steel and cast iron piston materials are investigated and compared with aluminum piston. After that, evaluation of four coating materials which are added on the top of the piston crown as thermal barrier coating namely, Yttria-stabilized Zirconia, MgZrO3, Alumina, and Mullite are examined. Next, the effective of different thickness coating layers on the temperature distributions of the top coating, bond and substrate surfaces are investigated.
Structure finite element analysis of the actual piston is simulated and Von Mises stress and deformation of the piston is obtained. Comparison between simulated results for aluminum, steel and cast iron material are discussed .Moreover, the influence of different coating thickness on the Von Mises stresses of four coating materials which are considered before are investigated and compared .
from the simulation results, it is found that the temperature distribution of cast iron piston surface is higher than aluminum and steel piston materials. In additions, it is observed that the temperature uncoated piston surface. Also, it is obtained that the coating thickness has a significant effect on temperature distribution of the piston surfaces. Moreover, it can report that the maximum Von Mises stresses for the piston materials are decreasing with increasing the coating thickness.