Abstract
Nowadays, extruded aluminum part is widely used for high speed train because it helps to enhance the light weight with relatively high strength. In this research, the extruded underframe part of the high speed train (Fig.1) is investigated considering the anisotropy issue with respect to its extrusion direction that is evolved during the extrusion process. In order to figure out the anisotropic characteristics, experimental approach based on the uniaxial tensile tests is proposed to evaluate the anisotropy of the extruded part, and, the directionality is analyzed by the deformation-induced anisotropy during the extrusion process considering the process characteristics. Moreover, the extruded part has the several numbers of seam line because it is produced by porthole die extrusion, so, the effect of seam line is also considered.
