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A finite element analysis of metal‐forming problems with an elastic‐viscoplastic material model
Author(s) -
Chandra Abhijit,
Mukherjee Subrata
Publication year - 1984
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1620200906
Subject(s) - viscoplasticity , constitutive equation , extrusion , finite element method , plasticity , creep , metal forming , materials science , plane stress , sheet metal , structural engineering , mechanical engineering , engineering , composite material
A finite element formulation for elastoviscoplasticity problems in the presence of large strains and deformations is presented in this paper. The formulation is capable of using any of a class of combined creep‐plasticity constitutive models with state variables for the description of material behaviour. The specific problem considered is plane strain extrusion using the constitutive model originally proposed by Hart. Numerical results are presented for sample problems and the important effects of extrusion speed and friction (at the die–workpiece interface) on the residual stresses in an extruded sample are investigated. The computer program developed here is quite general and can be modified to solve problems for other manufacturing processes like rolling, sheet forming, etc.