Читать книгу The Rheology Handbook - Thomas Mezger - Страница 51

1 With controlled shear rate (CSR): Profile γ ̇ (t) in the form of a step-like function, see Figure 3.1; or as a shear rate ramp, see Figure 3.2.

2 With controlled shear stress (CSS): Profile τ(t), similar to Figures 3.1 and 3.2. The shear stress ramp test is the “classic method” to determine the yield point of a sample (see Chapter 3.3.4.1b).

Measuring result: Flow curve τ(γ) or γ ̇ (τ),

respectively, see Figure 3.3.

Usually, flow curves are plotted showing γ ̇ on the x-axis and τ on the y-axis; and rarely reversed. This also applies to curves which are obtained when controlling the shear stress.

Further results: Viscosity function η( γ ̇ ), see Figure 3.4; or η(τ), respectively.

Usually, viscosity curves are presented showing γ ̇ on the x-axis and η on the y-axis. This also applies to curves which are obtained when controlling the stress.