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Abstract

The formability may be restricted by either a strain limit, or a force limit. In case of the latter the process may be repeated for increased formability. In an actual press forming operation the product may be rejected by numerous causes, not only fracture. This illustrates that formability is a more complex concept that is not a straightforward material property in the strict sense. However for a certain prescribed process/product the formability can be related to a set of material parameters.