Abstract:
The purpose of this research is to study Finite Element Technique to find the approximated resultsfrom forming of cylindrical shaft by forward bar extrusion process. The extrusion process can beconsidered to consist of large deformation of a rigid-plastic or rigid-viscoplastic material. Theproblem is highly non-linear in nature because of the material behavior. Therefore, the governingequation ( Constitutive Equation ) which shows the relationship between stress and strain ofviscoplastic material. The Binghams constitutive model has been chosen to describe itsconstitutive relations. The material in the simulation assumed to behave identically to a viscoplasticincompressible, macroscopically homogeneous and isotropic non-Newtonian fluid.The Eulerian description of finite element flow formulation coupled with boundary friction wasemployed. This is used to produce and analyze for the forward bar extrusion of cylindrical shaftunder isothermal condition and without friction occurred at the interface of material and tool.Normally, the quality products are usually produced in a fairly steady state as the material flowsthrough the die. The Eulerian description has been employed which sets the coordinate axes fixedin space as a material particle passes through the deformation zone. In conclusion, the results fromthe finite element formulation are in accordance to other related experimental results of otherspecialists and the simulation results from other commercial software such as Marc Mentat. It ispossible to simulate the forward bar extrusion problem of various materials.