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Forming limit diagram of aluminum AA6063 tubes at high temperatures by bulge tests
Seyed Jalal Hashemi,Hassan Moslemi Naeini,Gholamhossein Liaghat,Rooholla Azizi Tafti,Farzad Rahmani 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
A free bulge test and ductile fracture criteria were used to obtain the forming limit diagrams (FLD) of aluminum alloy AA6063 tubesat high temperatures. Ductile fracture criteria were calibrated using the results of uniaxial tension tests at various elevated temperaturesand different strain rates through adjusting the Zener-Holloman parameter. High temperature free bulge test of tubes was simulated infinite element software Abaqus, and tube bursting was predicted using ductile fracture criteria under different loading paths. FLDs whichwere obtained from finite element simulation were compared to experimental results to select the most accurate criterion for prediction offorming limit diagram. According to the results, all studied ductile fracture criteria predict similarly when forming condition is close tothe uniaxial tension, while Ayada criterion predicts the FLD at 473 K and 573 K very well.