Fibers and Polymers

, Volume 3, Issue 3, pp 120–127

Nonsteady plane-strain ideal forming without elastic dead-zone

  • Kwansoo Chung
  • Wonoh Lee
  • Tae Jin Kang
  • Jae Ryoun Youn
Article

DOI: 10.1007/BF02892628

Cite this article as:
Chung, K., Lee, W., Kang, T.J. et al. Fibers Polym (2002) 3: 120. doi:10.1007/BF02892628

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.

Keywords

Rigid-perfect plasticity Nonsteady bulk forming Characteristic method Orthogonal convective coordinate system 

Copyright information

© The Korean Fiber Society 2002

Authors and Affiliations

  • Kwansoo Chung
    • 1
  • Wonoh Lee
    • 1
  • Tae Jin Kang
    • 1
  • Jae Ryoun Youn
    • 1
  1. 1.School of Materials Science and EngineeringSeoul National UniversitySeoulKorea

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