drheolmeasuhttps://pages.mtu.edu/~fmorriso/cm4655/TAInstruments/2013TA_10stepstogoorements.pdf

Hello Sandeep,

to correct the data for viscometry, you’d need to back calculate to the correct torque and angular velocity by dividing the stress and shear rate by the stress and strain constants that you used.

shear stress = torque x c1 [the stress constant of the tool]

shear rate = angular velocity x c2 [the strain constant of the tool]

After this you’d Calculate the true stress and strain using the right C1 and C2 factors. And then lastly calculate the viscosity from stress divided by shear rate.

If you were making oscillation measurements it could be difficult to calculate this true stress and strain if there was significant inertia. But theoretically it would be a similar calculation as above, but using the constitutive equations for the viscoelastic variables.

G’=(|stress| / |strain|) X Cos (phase angle)

G”=(|stress| / |strain|) X Sin (phase angle)

G*=|stress| / |strain|.

Eta*=|stress| / (|strain| x angular frequency)

hope this helps!