Finite Element Strength Analysis on Cylinder Head of a Small Gasoline Engine

The cylinder head of a small gasoline engine was analyzed with FEM to evaluate the structural strength. A FEM-model of the cylinder head was built with 10-node tetrahedron element and arranging different density of elements. The element quality is guaranteed with the mesh parameters. Among the thermal boundary conditions, the heat transfer coefficient on the fire face of the cylinder head was educed by calibrating and comparing the computed temperatures at featured points with measured data. Then the temperature field of the cylinder head was analyzed. Based on the assembling load, temperature field and cylinder gas force, the coupling stress was obtained and five dangerous points were determined. The structural strength analysis with Goodman method shows that all the five points are in the safe area, so the cylinder head has enough fatigue strength.