Abstract
Biaxial stretching of a flat sheet is analyzed on the basis of assumptions previously used for the study of tensile deformation. The problem is idealized into three phases: (I) homogeneous deformation up to maximum load; (II) deformation localization under constant load; and (III) necking with a prescribed neck geometry. Results from this analysis can be compared with the right-hand portion of the forming limit diagram; such comparisons are given for the well-documented material A-K steel and for 1100-H19 aluminum.
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