By Gebhard Schramm
"It is was hoping that this e-book, in attempting to supply easy motives for occasionally advanced phenomena and giving suggestion on 'what to do and what to not do', can result in readers to realize an perception right into a box that's scientifically and technically interesting and commercially rewarding."
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Additional info for A Practical Approach to Rheology and Rheometry
Of equal exponents n. Although the different grades of polymer melts have different viscosity curves a CS-analysis will allow a good comparison since the polymers are equally non-Newtonian and their flow pattern in the capillaries or shearing gaps is alike. 49 Rheology Viscosity [Pas] CR-data comparisons (see Fig. 92. This makes a direct comparison of similar polymer melts difficult or even impossible. Shear rate [1/s] Fig. e. semi-solids which show solid and viscous behavior as a function of shear rate and shear history.
Shear rate [1/s] Fig. 18 a 3-decade increase in shear rate increases the shear stress also by 3 decades for the Newtonian liquid while it only results in a single decade increase of shear stress for the non-Newtonian PMMA melt: τ = 45000 to 450000 Pa. 44 Viscosity [Pas] Rheology 3000 500 Shear rate [1/s] Fig. 19) the Newtonian liquid is represented by a parallel to the shear rate abscissa: viscosity is independent of shear rate, while the PMMA-melt viscosity decreases from η=3 000 to 500 Pas (100 to 16%) for a 1-decade shear rate increase.
For a cone with Rc=30 mm and RT=3 mm, the truncation error is 1%. The effect of truncation becomes more important for cones of smaller Rc. Truncation may be considered as a compromise between the wish for optimum test results and the minimization of errors that might occur unnoticed due to wear on the coneand-plate sensor systems. b. Shear stress t τc = Rc = Md = A = c + ǒ 3 2p @ R Ǔ 3 c @ Md + A @ Md  shear stress on the cone [Pa] outer radius of the cone [m] torque to be measured [N⋅m] shear stress factor as contained in the above bracket – it is constant for a given cone-and-plate sensor sytem.