Abstract
A slender structural element like a tube or a profile bar can be air bent in a plane in such a way that the ends of the element are fixed in chuckings which are moved in a beforehand calculated way. Using the theory of a moving extended yield hinge and taking an elastoplastic material law with isotropic hardening, it is possible to bend the workpiece into the shape of a S, so that the curvature is constant along a great part of the workpiece. Experiments with copper tubes show a good repetitive accuracy of the process.
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