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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 9/2 - 2006  - pp.137-165  - doi:10.3166/ijfp.9.137-165
TITLE
Anisotropy Effects in Traditional Cylinder Compression of Aluminium

ABSTRACT
The phenomenon of double bulging, or formation of a twin barrel shape, was investigated in cylinder compression under conditions similar to hot forging of aluminium. Cylinders with initial aspect ratio of two, made from the alloys AA 6082 and AA 6060, in extruded and as-cast condition were compressed between heated parallel dies. After 25% reduction in height the extruded cylinder developed a double-bulge shape corresponding to earlier in literature reported shapes occurring in cold forming. When a cylinder of the same alloy in the as-cast condition was compressed the same way a single bulge formed. FE-simulations using an isotropic material description did not predict double bulging for these cylinders unless exaggerated external heat transfer parameters were used. Material flow characteristics and material state effects on the phenomenon of double bulging are discussed. Hills anisotropic material description was used to investigate the effect of anisotropy on metal flow in finite element simulations. When sufficient anisotropy was defined for the workpiece material the double bulging phenomenon did also appear in the simulation model.


AUTEUR(S)
Dirk NOLTE, Henry VALBERG

KEYWORDS
Aluminium Forging, Hot Forging, Open-die Forging, Cylinder Compression, Anisotropy, Grain Orientation.

LANGUE DE L'ARTICLE
Anglais

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