The heavy duty diesel engine must have a large output for maintaining excellent mobility.
For this reason, the engine has been developed to increase the peak pressure. The higher
peak firing pressures provide more efficient combustion, improved performance and
reduced emissions. But the increased maximum pressure causes larger stress and more
chances of displacement. Thus the perdition for the engine under operating conditions is
needed at the design step.1,2 Currently the compacted graphite iron (CGI) is a material
under study for the diesel engine demanded for high torque, durability, stiffness,
fatigue.3,4,5 CGI has 75 % increase in durability and 40 % increase in hardness when
compared to iron. In this study, a three-dimensional finite element model of a heavy-duty
diesel engine was developed to conduct the stress analysis by using property of CGI. The
FE model of engine includes a cylinder block, a cylinder head, a gasket, a liner, bearing
and bearing cap. The loading conditions of the engine are pre-fit, assembly load and
operational gas load. The stress distribution was studied under the loading conditions.
When the engine operated, the cyclic gas load was caused by the movement of the
connecting rod on the cylinder block and the bearing cap.