Abstract
A computer-aided workability evaluation system, (CAWES), has been developed and coupled to an elasto-plastic large-strain finite-element package to check for ductile fracture at all locations in bulk formed workpieces, using different workability criteria. To compare the results of these criteria, a relative fracture index, γ, is introduced, which is a dimensionless parameter measuring the proximity of a material to fracture. The new procedure is used to determine the workability limits in upsetting and bolt heading, and it renders itself useful as a design tool. This is demonstrated by an example where a selection is made from two alternative preform designs for the backward extrusion of a cup-shaped product.
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