Experimental and numerical investigation of constrained grooved pressing of aluminum sheet using rubber pad plate
Abstract:
Severe plastic deformation processes drastically change the microstructure of materials and improve the mechanical properties of materials. Modifications that improve performance in severe plastic deformation processes are of great importance. In this research, in order to investigate and improve the plasticity behavior of aluminum sheets, it is proposed to investigate the constrained groove pressing (CGP) process using polyurethane rubber pad on 6061 aluminum sheets by both numerical and experimental methods. In the first stage, finite element simulation has been done using ABAQUS software. Four plans have been presented for modeling the CGP process using rubber pads, and by comparing the results with the traditional CGP process, the appropriate design has been selected for conducting experimental tests. A more uniform strain distribution was obtained in the simulation of CGP process with rubber pad compared to traditional CGP process. The experimental tests of CGP process were carried out using polyurethane rubber pad on aluminum sheets. An increase in the number of passes was observed in the rubber pad CGP process compared to the traditional CGP process. The average value of microhardness in the traditional CGP process was 54.55 Vickers, while this value increased to 63.47 Vickers in the CGP process with polyurethane rubber pad. The CGP process using polyurethane rubber pad increased the ultimate strength by 17% compared to the traditional CGP process, which indicates an improvement in mechanical properties.