Читать книгу The Rheology Handbook - Thomas Mezger - Страница 159

1st interval (shear rate ramp upwards, in t = 120 s): with γ ̇ = 0 to 1000 s-1

2nd interval (high-shear phase, for t = 60 s): at γ ̇ = 1000 s-1 = const

3rd interval (shear rate ramp downwards, in t = 120 s): with γ ̇ = 1000 to 0 s -1

Therefore here, the total test duration is t = 300 s.

Figure 3.43: Flow curves obtained when controlling the shear rate, showing a hysteresis area:

(1) with decreasing, and (2) with increasing structural strength when shearing

Figure 3.44: Flow curves obtained when controlling the shear stress, showing a hysteresis area: (1) with decreasing, and (2) with increasing structural strength when shearing