Fibers and Polymers

The Korean Fiber Society (한국섬유공학회)
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Nonsteady Plane-strain Ideal Forming without Elastic Dead-zone

  • Chung, Kwansoo (School of Materials Science and Engineering, Seoul National University) ;
  • Lee, Wonoh (School of Materials Science and Engineering, Seoul National University) ;
  • Kang, Tae Jin (School of Materials Science and Engineering, Seoul National University) ;
  • Youn, Jae Ryoun (School of Materials Science and Engineering, Seoul National University)
  • Published : 2002.09.01
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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 fellowing 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.

Keywords

References

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