Effect of Section Thickness on Magnitude of Shape Variations during Cooling of Flat, Extruded Sections
Martin Kristoffersen, B. Andersson, and A. Pilipenko, SINTEF Materials Technology, University of Oslo
Track: EXTRUSION PROCESS - Extrusion Process
ABSTRACT ---Flat sections of the aluminum alloys AA6060 and AA5005 (AA5005
is a non-heat treatable equivalent of the AA6060 alloy), with thickness ranging from
2.5 mm (0.1) to 0.25 mm (0.01), have been cooled from 550°C (1022°F) to room
temperature by water-cooling one surface and air-cooling the other. This gives large
differences in heat transfer conditions on opposite surfaces, which provokes large
shape variations. From the performed experiments, it has been determined how the
magnitude of thermally induced deformations varies with section thickness.
Numerical simulations of the experiments have been performed with the
commercially available FEM software ABAQUS and compared to experimental
results. A qualitative agreement between experimental and numerical results has
been shown. The numerical results were used in order to understand the governing
mechanisms of the shape variations.
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