EXPERIMENTAL DETERMINATION OF RHEOLOGICAL BEHAVIOUR OF HTGHLY VISCOUS MODEL MATERIALS

This paper introduces the principle and method for determing the rheological behaviour of highly viscous materials.Not only can the apparent shear strain rates, and non-newtonian shear strain rates of the materials be determined thereby but also the flow indexes, stress indexes and apparent viscosities.The rheological properties of a polymer model material "M503", a mixture of half-and-half of XM-50 (a sealing material) and talc powder by weight are subjected to determination.The test results show that the M503 is a pseudoplatic material and that its stress indexes vary from 1.15 to 3.33 and the apparent viscosities range between 4.69×10⁷ and 0.99×10⁷Pa·s when the non-newtonian shearstrain rates are between 7.52×10⁵s^-1 and 105.56×10^-5s^-1.