Mechanical retardation and relaxation in liquids
This research was initially motivated by interest in the bulk properties of lubricating fluids since little was known about the response of a liquid to a rapidly changing stress. In elastohydrodynamic lubrication, elastic deformation of the contact surfaces occurs with the accompanying development of a very high pressure which, in the centre of the contact zone, may reach 10,000 atm. The fact that this phenomenon is essentially non-linear does not detract from the need, in the first instance, to study the linear viscoelastic behaviour over wide ranges of temperature and pressure. Accordingly, the author and his colleagues have conducted a detailed study of the viscoelastic behaviour of liquids when these are subjected to sinusoidally oscillating shear stress, the amplitude of which is sufficiently small for the response to be restricted to the linear viscoelastic region.
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