ABSTRACT
A new procedure for parameter identification for the material characterisation of rubber blends is proposed which is based on genetic algorithms. Because the highest exit speed of a die through a capillary is up to 1000 mm/s, the shooting of the exit of capillaries cannot be investigated with common cameras. An effective method to determine the diameter of a strand without consideration of time effects is the measurement with a microscope. Because no time dependent properties are considered this method is only for validation and not for characterisation. The fastest method to determine the diameter of a strand is the usage of the so-called swell value measuring unit. The measurement of the pressure is performed before the capillary entry. In order to determine the true viscosity curve the calculation of the true shear rate is necessary. Genetic algorithms have demonstrated remarkable merits over gradient-based optimization methods in widespread engineering areas.
