Two-dimensional modeling of thermal-stresses of a new material design engine valve

الملخص EN

High range of thermal-stresses in the engine exhaust valve is very important parameter to determine the wear occurs between the valve seat and valve head.

In present work two dimension (FE) (Thermal – Stresses) model is created and solved by using ANSYS 5.4 software to predict the temperature and thermal stresses distribution during the engine exhaust valve cycle from the intake stroke (LPP) to high peak pressure (HPP).

Heavy-duty diesel engine specifications are used through the simulation.

The temperature was assumed to be varying from 42C to 600C, while the pressure was assumed to be varying between 2.85 bars to 180 bars at peak pressure.

A new material is proposed to reduce the effect of temperature rising and the induced stresses in critical contact area of the valve by material coating the valve with new ceramic material.

The results show the temperature and the stresses distribution through the valve and valve seat.

Stresses concentration increasing with the increasing of pressure and heat flux.

The coating material leads to decrease the heat transfer to the valve material and leads to decrease the thermal stresses induced in such material.