FEM-Based Deformation Regression Analysis of ECAE Strains

The present article is focused on the regression-based generalization of FEM simulation results, derived through the introduction of QForm 2D FEM software to copper workpieces simulated flow through 20 angular dies with external R and internal r die radii in channel intersection zone, and the width of the inlet and outlet die channels is a = 35.4 mm. Regression power dependences for ECAE sfrain, sfrain unevenness, and workpiece waste fore part area have been derived for the 125 cases of FEM simulations for the angular dies with different values of channel intersection angles 65 degrees <= 20 <= 135 degrees, external and internal die dimensionless radii 0.028 <= R/a; r/a <= 1.977 and dimensionless workpiece length 5.226 <= L/a <= 16.836. Good agreement of derived computational results with known published experimental and computational data for sfrain and sfrain unevenness has been found. The derived results of regression analyses provide improvement in the understanding of the influence of generalized ECAE die geometry and workpiece length on copper workpiece pressure working conditions.