Use of Least Square Procedures and Ansys Polyflow Software to Select Best Viscosity Model for Polypropylene

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This work was intended to select the best viscosity model of polypropylene (PP) data using the percentage root-mean-square error function (PRMSE) and ansys package. Eleven samples of polypropylene (KPC - PP113) were tested at different loads and constant temperature 230oC using melt flow index tester (SUST plastic laboratory) and the results for each sample were recorded. Different viscosity models (viscosity versus shear rate) were checked using polyflow and the best of them was selected using PRMSE function. It was found that PP 113 shear stress versus shear rate was Non-Newtonian and PRMSE beside easy to apply get an accurate model to quote viscosity.

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