Abstract

In order to predict the behaviour of lubricating fluids which are to be operated under elastohydrodynamic conditions, the designer requires to know the rheological properties of the lubricant at the pressure, temperature, and rate of shear encountered in practice. A review is given of the available evidence aimed at establishing a formal connection between the rate of shear behaviour and that observed under alternating shear stress. It is shown that the viscoelastic properties of liquids in oscillatory shear can be successfully predicted on the basis of a new phenomenological model and that complete results are available from oscillatory experiments. Possible correlation of these results with rate of shear behaviour is suggested.

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