Investigation of Equal-Channel Angular Pressing of Steel/Copper Bimetallic Rods and Effect of Cu-Shell Thickness on Imposed Surface Stretch

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ETEMADI M.; RASHIDI A.M.

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Journal: Modares Mechanical Engineering Year:2021 | Volume:21 | Issue:2 Page(s): 79-89

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Information Journal Paper

Title

Investigation of Equal-Channel Angular Pressing of Steel/Copper Bimetallic Rods and Effect of Cu-Shell Thickness on Imposed Surface Stretch

Author(s)

ETEMADI M. | RASHIDI A.M. | Issue Writer Certificate

Keywords

Equal Channel Angular PressingQ1

Steel/Copper Bimetallic MaterialsQ1

Surface StretchQ2

Shell ThicknessQ1

Ultimate Tensile StrengthQ1

Abstract

To determination of equal-channel angular pressing(ECAP) process on the stress-strain behavior of steel core of steel/copper bi-metal and also the effect of Cu-Shell Thickness on the created Surface Stretch during ECAP, the bimetallic samples composed of steel rods with 8 mm diameter and copper shells with 0. 75 mm thickness are prepared. Both bimetallic samples and steel rods with 9. 5 mm are subjected to consecutive ECAP process using a die with an inner angle 90° and an outer curvature corner angle of 30o. The applied load and punch displacement are recorded during samples passing through an ECAP die. The tensile testing is carried out on both the initial and ECAPed series. Moreover, the dependence of Surface Stretch to diameters, Shell Thickness, and strength properties of constituents of core/shell bimetallic rods is analytically modeled. Then, the finite element method (FEM) is used to investigate the effect of Cu-Shell Thickness. The obtained results revealed that the Ultimate Tensile Strength of the bimetallic core and steel rods are improved by approximately 60% and 108% by ECAP deformation, respectively. The applied punch load for passing of bimetallic sample through an ECAP die is 54% less than the ones for steel rod. According to the FEM results, the maximum value of Surface Stretch is linearly decreased with increasing the thickness of the copper shell. The obtained results show a good agreement between the analytical model and the FEM approach.

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