Definition
The flow properties of fluids and semifluids used to minimize wear and friction and the methods and instruments used to measure these properties are the focus of this entry.
Introduction
Rheology in terms of mechanics is the relation between force and deformation in material bodies. The nature of this relation depends on the material of which the body is composed of. The deformation behavior of metals and other solids is represented by a model called the linear or Hookean elastic solid (displaying the property known as elasticity). In fluids, the deformation behavior is represented by a model called the linear or Newton’s viscous fluid (displaying the property known as viscosity) [1]. These classical models are, however, inadequate to depict certain nonlinear and time-dependent deformation behavior that is sometimes...
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Zaki, N., Lindemann, L. (2014). Viscosimetry of Lubricants. In: Mang, T. (eds) Encyclopedia of Lubricants and Lubrication. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22647-2_50
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