![]() If the shear rate is used in CAE analysis, it is corrected to a true value, using Bagley correction, Rabinowitsch correction, and so on, to improve analysis accuracy. Note, however, that the shear rate determined by calculation is called the apparent shear rate (or shear stress), not the true shear rate (or shear stress) on the capillary wall. For PPS, which is a non-Newtonian fluid, the detected load (shear stress) varies with the piston rate (shear rate), so that the shear rate dependence of the melt viscosity can be determined by changing the piston rate at will. ![]() 6.10), a capillary rheometer detects the load when the molten resin is extruded with a piston at a constant rate, using a load cell, after which the melt viscosity is determined by applying Formulas 6.2 to 6.5. This method differs from the MFR method, however, in that the fluidity can be determined as melt viscosity (units: Pa・s), not as the resin weight per unit time. ![]() ![]() A capillary rheometer is used for that test method whereby the specimen melted in a cylinder is extruded through a capillary, in the same way as with the MFR. ![]()
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