Bppa. Gouveia et al., STEADY-STATE FINITE-ELEMENT ANALYSIS OF COLD FORWARD EXTRUSION, Journal of materials processing technology, 73(1-3), 1998, pp. 281-288
Citations number
17
Categorie Soggetti
Material Science","Engineering, Manufacturing","Engineering, Industrial
Finite-element analysis of metal forming processes is treated predomin
antly by the Updated Lagrangian formulation in which the mesh moves an
d deforms in space, in accordance with the deformation history of the
material. However; the steady-state deformation characteristics of som
e metal forming processes such as extrusion, drawing and rolling, can
be analysed advantageously using an Eulerian formulation in which the
finite-element mesh is fixed in space. Extension of the latter to incl
ude work hardening material response can be accomplished through the u
se of a combined Eulerian-Lagrangian formulation. Such extension is ba
sed on the utilisation of an Updated Lagrangian temporary mesh, to cal
culate the strain and stress fields, coupled with a mathematical schem
e to interpolate the strain and stress tensors into the Eulerian mesh,
in order to determine the new distributions at the fixed mesh positio
ns. An example of steady-state cold forward rod extrusion is analysed
using both the Updated Lagrangian and the combined Eulerian-Lagrangian
formulations. Comparisons are made between the theoretical finite-ele
ment predictions and experimental data obtained through the utilisatio
n of visioplasticity and micro-hardness techniques.