Abstract
The deformation observed during oscillatory shear of concentrated suspensions indicates the alternate occurrence of two structures: the first at small deformations gives rise to approximately linear viscoelastic behavior, while the second is a virtually undeformable structure formed at large deformations. The behavior at small deformation is characterized by a dynamic viscosity which at low frequencies is inversely proportional to the frequency: at higher frequencies the viscosity levels off. This transition is ascribed to sheet formation by the suspended particles during shear in the low frequency region; in the high frequency region sheet formation is less developed. In accordance with this interpretation is the deformation at which the undeformable structure originates, as a function of frequency. The origin of this structure is attributed to the following: once the shear leads to an increase in solid content in a part of the system, the apparent viscosity there rises which causes an additional increase in solid content. This finally leads to a blocking of further deformation.
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