Bostjan Mavric
Institute of Metals and Technology, Ljubliana
Slovenia
Direct chill casting is widespread technology for casting of aluminium billets and slabs, which are further used for extrusion. Achieving high quality of the product is difficult since the thermomechanical phenomena that occur during DC casting of aluminium billets can have a significant impact on the quality of the ingot because of hot tearing and cracking which can occur under specific stress conditions.
A meshless local collocation method using radial basis functions has been developed to model the thermomechanical phenomena. The model uses elastic-viscoplastic model to describe the inhomogeneous material below the coherency isotherm. The model is coupled with the results of the fluid flow model of the process. Its results are used to determine the computational domain, calculate the thermal strain, and in the formulation of hot-tearing criteria.
In the seminar, the formulation of the model and its performance will be presented, along with a selection of results of the model.