Brookfield DV-III Ultra Rheometer - Manual (Page 112)

Brookfield Engineering Laboratories, Inc. Page 112 Manual No. M98-211-E0912
The shear stress measurement range for the three standard (or supplied) vane spindles at each spring
torque is as follows:
Table D-5
SPINDLE
MODEL CODE
ON DV-III ULTRA
SCREEN
TK
SHEAR STRESS
RANGE (Pa)
V-71 LV .09373 0.047 - 0.47
V-72 LV .09373 0.19 - 1.9
V-73 LV .09373 0.94 - 9.4
V-71 RV 1 0.5 - 5
V-72 RV 1 2 - 20
V-73 RV 1 10 - 100
V-71 HB 8 4 - 40
V-72 HB 8 16 - 160
V-73 HB 8 80 - 800
V-71 5xHB 40 20 - 200
V-72 5xHB 40 80 - 800
V-73 5xHB 40 400 - 4000
Calculations for Shear Stress in Yield Test
The following equations can be used to calculate the shear stress values after each packet of data
is obtained from the DV-III Ultra.
TK x YMC x T
10
τ
=
Where:
τ
= Yield Stress (Pascals)
TK = Model Torque Constant from Table D-2
YMC = Yield Multiplier Constant from Table D-3
T = % Torque reading
The following equations can be used to calculate the strain data after each packet of data is obtained
from the DV-III Ultra:
γ
=
θ
M
— (S x T)
Where:
γ
= Strain (rad)
θ
M
= Angular rotation of motor shaft (rad)
S = Radial Spring Factor (rad/% torque)
T = % Torque reading (%)
= ω x t x θ
M
2 π
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