Comparative analysis of stress-strain state of bars from aluminum alloys A2024 and A7075 processed by RSR based on FEM modeling

Abstract

In this article the analysis of temperature conditions and stress–strain state during radial-shear rolling (RSR) of bars from industrial deformed aluminum alloys A2024 and A7075 was carried out. The RSR was made for four different variants of elongation ratio µ for each alloy: 1.2, 1.6, 2.0, 2.4. It is shown that for the alloy A2024 in the zone of maximum reduction, the growth of elongation ratio leads to the increase in the temperature difference, and for A7075, the temperature difference decreases. After rolling the temperature of bar increases due to the deformation heating in average by 5–30°C in dependence on reduction per pass. At deformation with µ <2.0 the axis zone of bars is characterized by the presence of positive average stresses. The analysis of stress triaxiality parameter showed that the alloy A2024 has a large margin of technological plasticity in comparison with the alloy A7075 when deformed by the RSR method with similar parameter.