Demostració pràctica de la validesa dels models matemàtics en elements finits. Aplicació al model de Cross

The mathematical model's validity used in computer programs are based on a specific formula implemented leading commercial software. Since these programs use their own databases of materials sometimes the question arises of what the miscalculation in what we are committing or sometimes what can happen when incorporating external data materials tested in other laboratories. In the present work, developed the practice's materials engineering used in the formulation of the model to calculate cross what the viscosity behavior in some recycled materials that are not included in the databases of package's calculations and also allows us to calculate deviations with respect to the real transformation of specimens tested