Simulation of reversed torsion of the AlMg6 aluminium bar using the macro-molecule approach

Abstract

The specified macro-molecule approach is tested using the reversed-torsion load case for the 30×10×10 (mm) bar made of AlMg6 aluminium alloy. The work has two parts: the experiment part and the calculation part. The experiment is carried out using both the automatic INSTRON torsion machine and the AVERY torsion machine with manual control. The available backlash between the deformed bar and the torsion grip is taken into account. The calculation model is developed using the MSC.Adams software.The reversed-torsion load case consists of the nine modes: 1) original backlash mode (optional), 2) one-directional 90º torsion, 3) unloading, 4) backlash mode, 5) 60º torsion in the opposite direction, 6) unloading, 7) backlash mode, 8) 30º torsion in the original direction, 9) unloading. The AlMg6 macro-molecule force characteristic is selected under condition that the experiment torsion curve and the calculated torsion curve are as close as possible.