Among numerous forming processes, the use of extrusion has been on the increase due to
the development in the equipment and materials used. It produces constant section prismatic pieces
with acceptable allowances and surface finishes [1]. The design of such processes has been in a trialand-error
fashion traditionally, which is in general costly and time consuming. An optimum design is
unlikely to be achieved in this way. With the increasing capacity of computer modelling and simulation,
it has been a major focus of research to model such forming processes accurately so that design can
be made and optimised computationally. The economic benefit of achieving such a goal is obvious.
However, there are gaps in the development of such analytical tools due to the complexity of the
problem in nature, especially concerning simulation of the process of deformation.