Abstract
This note is concerned with various experimental observations of plastic-flow behavior in presumably glassy states of low-molecular-weight lubricants subject to high shear rates and confining pressures. It is proposed here that the nearly linear relation found between shear stress and presssure can be attributed to shear-induced volume change, qualitatively the same as that associated with Reynolds dilatancy and shear strength in a hypothetical frictionless granular material. Recent computer simulations of the latter lend quantitative support to this hypothesis.
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