Brookfield YR-1 Rheometer Manual do Utilizador descarregar pdf (Página 50)

Brookeld Engineering Labs., Inc. Page 50 Manual No. M02-215-B0412

APPENDIX D - Calculations

The following equations can be used to calculate the shear stress values after each packet of

data is obtained from the YR-1:

τ =

TxYMCxT

where:

τ = Yield Stress (Pascals)

TK = Model Torque Constant from Table A-2 in Appendix A

YMC = Yield Multiplier Constant from Table A-1 in Appendix A

T = % Torque reading

The following equations can be used to calculate the strain data after each packet of data is

obtained from the YR-1:

γ = θ

– (S x T)

where:

γ = Strain (rad)

= Angular rotation of motor shaft (rad)

S = Radial Spring Factor (rad/% torque)

T = % Torque reading (%)

ω x

t x

2π

where:

= Angular distance of motor shaft (rad)

ω = Rotational speed (rpm)

t = time of test (seconds)

S =

cal

x (2π) x 0.01

where:

S = Radial spring factor (rad/%torque)

cal

= Spring windup angle (revolutions)

cal =

(

cal

x t

cal

)

60000

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Brookfield YR-1 Rheometer Manual do Utilizador Página 50