I have done an amplitude sweep of cell suspensions ranging from 0.01-100% strain by an Anton par interfacial rheometer. At lower strain, I am getting lower elastic modulus less than 0.001 Pa. at around 50-300% strain I am getting the higher elastic modulus than loss modulus. After 300% elastic modulus starts decreasing. Please help me to find out the physical significance of the experimental result.
At low strain the results in the applied forces and responses is very low, therefore you could have a low signal to noise ratio, leading to high error bars in your results. At medium strain levels normally the signal to noise is improved therefore your structure might be better analyzed. At high strain your structure is affected and deformed, thererfore the storage modulus is normally decreased. In order to get additional information you can try to apply also other frequencies (if possible).
You crossed the boundary between the linear and non-linear viscoelastic region, so the value of G 'started to decrease. This is a typical situation for non-linear behavior. Interpreting the data in this area, however, is definitely more difficult than in the linear one, but presumably application of LAOS, instead of SAOS will be required for your material.
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