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Elastic-Viscoplastic Analyses of Simple Stretch Forming Problems

  • N.-M. Wang
  • M. L. Wenner
Chapter

Abstract

Plane strain and axisymmetric punch stretching problems incorporating Coulomb friction are considered. Based on a general rate-sensitive flow theory and the nonlinear theory of membrane shells, the formulation includes work hardening and normal anisotropy. Two numerical schemes are presented. One is an extension of a previously developed finite element method (restricted to axisymmetric or plane strain problems) while the other is a nonlinear iterative method (restricted to plane strain). Experimental data on aluminum-killed steel are used to devise an explicit form for the rate dependence, and these schemes are applied to plane strain punch stretching (by a flat bottomed punch) and to hemispherical punch stretching. It is shown that a theoretical instability associated with the elastic-plastic analysis in plane strain stretching is removed by inclusion of the strain rate effect, while a better fit to experimental data on strain distribution in hemispherical punch stretching is obtained.

Keywords

Plane Strain Strain Distribution Strain Rate Sensitivity Deformation Theory Peak Strain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • N.-M. Wang
    • 1
  • M. L. Wenner
    • 1
  1. 1.General Motors Research LaboratoriesWarrenUSA

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