Modèle mathématique pour la prédiction de la vitesse d'érosion

Mathematical model predicting cavitation erosion rate

Institut de génie atomique, Ecole polytechnique fédérale de Lausanne

Abstract

A mathematical model incorporating the erosion process and the internal hardening mechanisms has been proposed to predict cavitation erosion rate of alloys. It takes into account both the material properties and the hydrodynamic conditions of cavitation. According to this model, the eroding material is subjected to the stress pulse loading conditions originated from cavitation collapse. The spacial and the temporal distribution of these pulses are random, but their amplitude is controlled by the flow conditions. Beside of mechanical properties, some metallurgical parameters such as work hardening rate and stacking fault energy have been introduced in the model. It can be applied to all types of cavitation and can be extended to erosion by liquid drop impacts or solid particle impact erosion.