Abstract
The scope of the current research on sheet metal forming is surveyed in the light of precise definitions of stretchability on the one hand, and deep drawability on the other. Particular emphasis is placed on the elucidation of basic concepts brought about by recent research, such as the distinction between the ductility of the material and the extent to which it is exploited in a particular process. Several outstanding problems in sheet metal forming are discussed for their potential benefit to sheet metal engineering. It is believed that present results will lead to greater refinement in the specification and selection of sheet metal in the future, as well as to investigations on such problems as wrinkling and non-coaxial strain paths.

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