Contribution Oral Presentation
COMBINING FLOW AND STRUCTURE MECHANICS MODELLING IN SOLIDIFYING REGIONS
A casting process usually starts with a liquid alloy that solidifies on cooling. Forced and/or natural convection in the melt as well as stresses and deformations that occur from uneven cooling of the just solidified part can be described quite accurately. The challenging range is when the amount of solid increases so that melt flow becomes more and more difficult while solid starts to build up a coherent network that becomes more and more rigid. In such regions, the solid network starts to transmit stress while the flow is dammed to zero. A physically sound description of these regions are crucial for understanding the formation of shrinkage porosity, hot tearing and even (deformation-induced) macrosegregation. In the present contribution we are presenting an overview about up-to-date experimental and numerical findings that are relevant for the aforementioned topics and discuss related issues that are still unresolved and thus need more research.