Abstract
Using the plane-strain theory of plasticity for rigid-non-hardening materials, the role of lubricant trapped in microscopic surface pockets of a work material by the tool surface in reducing the apparent coefficient of friction has been estimated. The hydrostatic pressure produced in the lubricant has been found to support a sufficiently large fraction of the contact pressure to account for the low coefficients of friction usually observed in metal forming, the effect being more marked for lubricant having a higher bulk modulus.
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