Abstract
Ever since the ideal forming theory has been developed for process design purposes, application has been limited to sheet forming and, for bulk forming, to two-dimensional steady flow. Here, application for the non-steady case was made under the plane-strain condition. In the ideal flow, material elements deform following the minimum plastic work path (or mostly proportional true strain path) so that the ideal plane-strain flow can be effectively described using the two-dimensional orthogonal convective coordinate system. Besides kinematics, schemes to optimize preform shapes for a prescribed final part shape and also to define the evolution of shapes and frictionless boundary tractions were developed. Discussions include numerical calculations made for a real automotive part under forging.
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Chung, K., Lee, W., Kang, T.J. et al. Nonsteady plane-strain ideal forming without elastic dead-zone. Fibers Polym 3, 120–127 (2002). https://doi.org/10.1007/BF02892628
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DOI: https://doi.org/10.1007/BF02892628