Mechanical analysis of a functionally graded cylinder-piston under internal pressure due to a combustion engine using a cylindrical super element and considering thermal loading


1 Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.


Increasing the performance of combustion engines has always been of interest to engine designers. In this regard, one approach has been to implement newly developed materials. Functionally Graded Materials (FGMs) have been shown to be heat treatable materials for high-temperature environments with thermal protection. Using these materials requires an understanding of the development of temperature and stress distribution in the transient state. This information is considered to be the main key in the design and optimization of devices for failure prevention. In this paper, a cylindrical Super Element (SE) has been employed to investigate the mechanical stress distribution of a cylinder-piston mechanism made of FGM for a combustion engine design. Analysis indicates that modeling a cylinder and piston with a few super elements gives the same results as a conventional nite element with 10052 elements. Materials are selected to be ceramics and metal with power low distribution. Results indicate that temperature distribution in  the thickness of the cylinder does not vary, as the power of material distribution exceeds the value of one, while temperature distribution variation is sensitive to power distribution less than one. This has a high e ect on stress distribution in both FG cylinders and FG pistons.