Abstract
The subject of this paper is a boundary element method (BEM) analysis of the axisymmetric extrusion processes. It is demonstrated that BEM may be used to analyse, efficiently and accurately, this complicated class of metal forming problems involving both geometric and material non-linearities. An updated Lagrangian approach is adopted in this analysis. The frictional conditions at the die-workpiece interface are introduced through a smeared interface element. Numerical results for sample problems of axisymmetric extrusion of Fe-0.05 carbon steel at a temperature of 1173 K, obtained by the BEM, are presented and discussed in this paper. A state variable elastic-viscoplastic model is used for material description. The BEM results are compared against those obtained by FEM for the same sample problems.
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