Читать книгу The Rheology Handbook - Thomas Mezger - Страница 110

Results of several shear tests measured at different, but constant temperatures (i. e. isothermal) can be presented in the form of a three-dimensional (3D) diagram, for example, with the shear rate γ ̇ on the x-axis, shear stress τ or viscosity η on the y-axis, and the temperature T on the z-axis.

Figure 3.24: Comparison of flow curves

Figure 3.25: Comparison of viscosity functions

Figure 3.26: Comparison of flow curves with and without a yield point

Figure 3.27: Comparison of flow curves:

(1) showing the slope s = 1:1 = 1, (2) with s < 1, (3) with s > 1

Figure 3.28: Comparison of viscosity functions: (1) showing the slope s = 0, (2) with s < 0,

(3) with s > 0

Figure 3.29: Comparison of viscosity functions; (4) showing a zero-shear viscosity plateau (i. e. there is no yield point), (5) without a zero-shear viscosity plateau (i. e. there is a yield point)