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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Quasi-static-dynamic formability of AA5052-O sheet under uniaxial and plane-strain tension
LIU Da-hai(刘大海), YU Hai-ping(于海平), LI Chun-feng(李春峰)

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:An experimental study on the quasi-static-dynamic formability specified in electromagnetically assisted sheet metal stamping (EMAS) was presented. A series of uniaxial and plane-strain tensile experiments were carried out on AA5052-O sheet by using a combined quasi-static stretching and pulsed electromagnetic forming (EMF) method. Failure strains representing formability beyond conventional quasi-static forming limits are observed under both uniaxial tensile and plane-strain states. The total forming limits of the as-received aluminum alloy undergoing both low and high quasi-static pre-straining are almost similar in quasi-static-dynamic deformation. Ultimate total formability seems to depend largely on the high-velocity loading conditions. Thus, it appears that for quasi-static-dynamic deformation, the quasi-static pre-straining of material is not of primary importance to the additionally useful formability. These observations will enable to develop forming operations that take advantage of this improvement in formability, and will also enable the use of a quasi-static preform fairly close to the quasi-static forming limits without weakening its total formability for design of an EMAS process in shaping large aluminum shell parts like auto body panels.

 

Key words: electromagnetically assisted sheet metal stamping (EMAS); aluminum alloy sheet; electromagnetic forming (EMF); quasi-static-dynamic deformation

ISSN 1672-7029
CN 43-1423/U

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