Abstract
SUMMARY The paper shows how the governing equations are modified by allowing a variation in yield stress throughout a deformation zone. The limitations imposed by these equations are discussed and a method is proposed to illustrate the effect of variable yield stress on the deformation pattern. From the study of a particular solution of plane strain extrusion, it is concluded that variation in yield stress should not markedly change the pattern of deformation from that appropriate to a non-hardening situation. This conclusion, therefore, gives support for the mean strain solution currently employed to accommodate strain hardening, particularly if this method is applied incrementally along the streamlines.
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