Thermal Response of a Metallic Mold to Thermoelastic Interactions at Its Inner Boundary—System Approach

Abstract

The system theory is used to analyze the thermoelastic interaction at the casting-mold interface and to develop a simplified model for the thermal response of the mold. It is revealed that due to the interaction at the interface, the surface layer at the inner boundary of the mold behaves thermally as an underdamped second-order system and not as an overdamped one. The latter would be the case if the thermoelastic interaction were neglected. This finding is verified experimentally, using molds of different materials and melts of different compositions. The effect of this thermoelastic interaction on the transient temperature field within the mold wall is demonstrated using a finite element model for a spherical mold of a uniform wall thickness.