DEFORMATION ANALYSIS OF THE METAL COMPOSITE EXTRUSION

초록

Composite rods consisting of two or more different material layers are widely used due to the diversity of properties such as high electrical conductivity, high corrosion resistance, high strength, wear resistance etc. [1]. Extrusion is related to large deformation of material and leads to non-homogeneous deformation within work-piece material. The mechanism of plastic deformation during the composite rod extrusion is much more complicated than that in the single metal extrusion. Deformation patterns in co-extrusion of two different materials are characterized by several process parameters. These parameters influencing plastic flow in co-extrusion are the conditions of contact and interface (core-sleeve) friction, volume ratio of the components, flow stress ratio, and the shape of die [2]. Many researches have been performed on the composite rod extrusion process analytically and/or experimentally. However, few numerical approaches have been applied to this particular process. In this paper, the co-extrusion process for composite rods is investigated by the finite element method. A commercially available FEA code, i.e. Deform2-D[3], was employed in the present analysis.