The purpose of this paper is to define a thermomechanical fatigue criterion in order to predict the failure of the cylinder heads issued with the lost foam casting process. The microstructure of the materials (A356-A319) is affected by the lost foam casting process which can directly affect the mechanical properties, the damage mechanisms and thefatigue failure of the materials. The major problem in defining a predictive fatigue criterion in this case is the fact that it should be on one side

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... plicable for the structure which is submitted to complex multiaxial thermomechanical loadings and on the other side should take into account the microstructural effects of casting process.