As a quality control engineer in a plastic industry, you were required to conduct a capillary test for polymer X using two dies with Length/Diameter ratio (L/D) of 10 and 30 respectively and diameter of both dies is 1 mm. In a Bagley correction procedure for the experiments, the measured pressure for different L/D ratio of capillary die is obtained as follows (Table 4.1): Table 4.1: Rheological data of polymer X Items L/D 10 30 AP app ) AP app ) (MPa) Shear Rate app) (1/8) 100 200 400 700 1000 3.3300 5.6900 8.6100 12.2600 15.8000 (MPa) 7.7500 12.4300 20.6700 28.5000 36.0200 Determine the true shear stress from the given data and analyse the results to show comparison between apparent and true shear stress. AP'app) AP app) ) Table 4.1: Rheological data of polymer X Items L/D 10 30 Shear Rate app) (1/5) (MPa) (MPa) 100 3.3300 7.7500 200 5.6900 12.4300 400 8.6100 20.6700 700 12.2600 28.5000 1000 15.8000 36.0200 Derive the Weissenberg-Robinowitsch expression to correct a shear rate of polymer rheological data for capillary die