Abstract
The results of an experimental study of rheological properties of typical lubricating greases are reported in this paper. Viscosity-shear rate relations are compared for steady-state shear and for transient shear conditions of stress relaxation and creep. In steady-state shear the systems are non-Newtonian, but under transient conditions of shear stress relaxation, they are linear viscoelastic for strains approaching their ultimate yield strain. The linear viscoelastic nature of two greases was confirmed by studies of the damping of a torsion pendulum for small strains. A sodium soap grease is shown to be linear viscoelastic by an analysis of creep data from the literature. Recognition of the wide range of strains for linear viscoelastic behavior simplifies the study of the flow and deformation of greases.
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