Stress-strain analysis of aluminum alloy cone bottom cylindrical parts in double-sided hydro-mechanical deep drawing process

This paper analyzes the forming mechanism of double-sided hydro-mechanical deep drawing process of the sheet. Based on numerical simulation and experimental research, the forming process of aluminum alloy cone bottom cylindrical parts was investigated, the development of plastic deformation and the wall thickness distribution law were analyzed, and the change of stress paths in the yield locus of the typical points was given. The optical measurement method based on the DIC(digital image correlation) technology is applied to analyze the strain distribution of parts in different forming stages. The relationship between the Lode parameter and the invariant line of wall thickness and the strain type is summarized. It lays the theoretical foundation and practical application experience for the application of the double-sided hydro-mechanical deep drawing method in the field of sheet metal. The results of strain analysis, numerical simulation, and experiment show that the distributions of wall thickness are consistent during the forming process, the minimum wall thickness is located at the cone bottom of the cylinder part and the maximum wall thickness is located at the flange.