For plastic parts that are manufactured by injection molding process, it is mandatory to predict accurate warpage at an early stage. Commercial process simulation tools have some limitations and some simplifications resulting in less accuracy of warpage prediction. The existing simulation models ignore temperature dependent mechanical properties and the stress relaxation spectrum for viscoelastic materials.
Ultrasim® is based on integrative simulation technology and can compensate for these limitations by offering a new, thermomechanics-based material model. This material model has been carefully developed by considering temperature dependent, non-linear mechanical properties, and stress relaxation behavior. The model also considers time dependent description of the warpage starting from packing phase of the molding process, followed by actual cooling and ejection.