LAUSR

ABSTRACT In the present study, the impact strength of refined grain pure copper developed by equal channel angular extrusion, up to eight passes at room temperature following route A with a constant ram speed of 20 mm/min through a die angle of 90° between the die channels was investigated. The impact strength of extruded specimens is evaluated for the as-received and the extruded specimens after four and eight passes at a strain rate of 1200 s−1 using Split–Hopkinson pressure bartechniques by experiment and the finite element method simulation. A total increase in the ultimate strength and yield strength are 128% and 68%, respectively, and observed for the extruded material after eight passes. Optical microscopic examinations show a grain refinement from 32 to 4 µm. The results of the numerical study are consistent with that obtained from the experiment.