Abstract
Rheology may be described as the search for the accurate constitutive equations relating the stress to the deformation in a liquid or soft solid. For the tribologist working in elastohydrodynamic lubrication (EHL), rheology is an essential element; however, the need is mainly for an accurate description of the pressure, temperature, and shear dependence of the viscosity. Liquid failure is also important but is not a topic typically addressed in polymer rheology. Some lessons can be learned from polymer rheology; however, it should be noted that the stresses, normal, and shear, are much greater in EHL than are studied in polymer rheology and rheological effects are occurring in materials that are never considered to be of interest to polymer rheologists. In this chapter, those features of polymer rheology which might be of use to EHL are given a cursory introduction.
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