A predictive model for the micro-porosity quantitative in Al-Si alloy

Battaglia, J.L., Rozot, J.M.

The fatigue is the most important criterion for the securities parts (brake system for example). The increasing use of shaped cast aluminium in the security automotive parts has focused interest on the fatigue of theses alloys. The specific foundry software use empirical laws that do not fit with the reality, above all concerning the aluminium alloys.

We proposed a new physical parsimonious model of the micro-porosity shrinkage behaviour. This model is based on the fundamental heat and mass transport equations. Theses equations are implicitly coupled. A finite element method is used in order to simulate the governing equation. A sensitivity analysis permits us to explain the significance of the initials and limits conditions which have be prove in an industrial production plant.