The piston is the most important component of internal combustion engines. The piston ring contains a ring pack and cylinder wall. The piston ring is the moving component and it is composed of aluminium matrix composites. The aim of the work is to determine the structural and thermal stress distribution of piston rings using CATIA and ANSYS. Combustion engine pistons transform heat energy into mechanical energy by expanding gases. The thermal and structural analyses were done on the piston rings model using the properties of aluminium matrix composites (aluminium A2024 alloy and fly ash).