Sliding cylinders rheometer

Barres and Leblanc94 have described the construction and use of a sliding cylinder rheometer which operates at very low shear rates and was intended for studies on structure development in filled systems rather than simulating processing flow. 

Barres C, Leblanc JL (2000) Recent developments in shear rheometry of uncured rubber compounds. I. Design, construction and validation of a sliding cylinder rheometer. Polym... 

Conventional rheometer geometries such as concentric cylinders, cone and plate and parallel discs are unsuitable, even when the rheometer is designed to allow measurement of normal forces. Many of the disadvantages of such geometries are overcome in the sliding-plate viscometer (Gunasekaran and Ak, 2002). In this instrument (Figure 22.9), the sample (the exact shape and size of which need not be known) is held between a... 

Equation 2.3.22 is independent of the constitutive equation because of the small angle. The result is a homogeneous shear field, like simple shear between sliding parallel plates or between closely fitting cylinders. Because stress and deformation rates can be determined independent of a constitutive equation, these flows are very useful as rheometers and are discussed further in Chapter S. 

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