Load/Displacement and Energy Dissipation Performances of Aluminum and Magnesium Extrusions Subjected to Quasi-Static and Dynamic Loading under Axial Crush and Cutting Deformation Modes

摘要

Findings from quasi-static and impact loading of aluminum(AA6082-T6) and magnesium (AZ31B-F) circular extrusionswhen subjected to crush and cutting modes of deformation arepresented. Circular cross sectional extrusion geometry with athickness of 1.5 mm, a diameter of 62 mm, and lengths equal to300 mm were selected. Dynamic loading resulted from impactwith a dropping mass of 57 kg at a velocity of 7 m/s. Undercutting deformation, the aluminum alloy extrusions generatedlengthy chips ahead of the cutter followed by stable formation ofpetalled cut side walls. The magnesium extrusions, illustrated theformation of small chips and sides walls which often, although notconsistently, fractured. Energy dissipation was noted to be greaterand the deformation more stable for the aluminum extrusions.Under a cutting deformation mode, energy dissipation of 0.621 -0.684 kJ for the magnesium extrusions was found compared to1.20 - 1.23 kJ for the aluminum extrusions.