EXPERIMENTAL AND NUMERICAL ANALYSES OF THERMOMECHANICAL BEHAVIOR OF SAND CAST IRON DURING SOLIDIFICATION

P. ALEXANDRE; A. GOUDOT; A. BEN CHEIKH; J. B. DALIN; D. CELENTANO; S. OLLER; E. OÑATE

Conferencia; Vth Engineering Foundation Conference on Modeling of Casting, Welding and Advanced Solidification Processes; 1990

During solidification and forming of the casting, thermal stresses due to temperature evolution are generated in the metal and the mold. The aim of this work is to study the coupling between thermal transfers and mechanical behavior in order to understand the effects of mechanical phenomena on casting defects. An experimental apparatus has been designed in CRPAM in order to measure displacements and temperatures in nodular cast iron and sand mold. Measurements have been performed in several points within the casting and the mold. In CIMNE and Renault, the numerical modeling of CRPAM' test has been carried out. The finite element package ABAQUS has been used to this end. An uncoupled mechanical simulation has been performed after running a thermal calculation. Contact elements have been included between the casting and the mold and temperature dependent elastoplastic consti1utive laws have been employed for both the casting and the sand mold. Some discrepancies are found between numerical and experimental results. We believe that it is mainly due to the modeling of the liquid phase and of the sand material.