Abstract
A detailed analysis of sheet drawing has been undertaken, employing the slipline field approach, that includes the effect of friction. The calculations indicate that, for a given die semiangle and reduction, increasing the friction decreases the die pressure and increases both the mean drawing stress (the work of deformation) and the midplane hydrostatic tension. Because of this last effect, die friction will enhance structural damage during sheet drawing.Experimental confirmation of the results was obtained from sheet drawing experiments, where, for a variety of drawing conditions, measured separating forces and drawing stresses closely agreed with those analytically determined. Further, agreement was obtained from comparative density measurements on commercially pure titanium drawn under conditions of good and poor lubrication.
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