Influence of pre-strain on the formability of 2024 aluminium alloy

Present work investigates the influence of pre-strain on the limiting strains in sheet metal forming, using the strain gradient evolution model that predict the onset of local necking from initial thickness imperfections, roughness waviness and thickness gauge. The theoretical analysis is compared w...

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Bibliographic Details
Published inInternational journal of material forming Vol. 2; no. Suppl 1; pp. 475 - 478
Main Authors Bressan, José Divo, Leacock, Alan G.
Format Journal Article
LanguageEnglish
Published Paris Springer-Verlag 01.08.2009
Subjects
CAE) and Design
Computational Intelligence
Computer-Aided Engineering (CAD
D. Banabic
Engineering
L. Delannay
Machines
Manufacturing
Material behaviour and formability: F. Barlat
Materials Science
Mechanical Engineering
O.Cazacu
Processes
T. Kuwabara
2024 aluminium
Formability
Pre-strain
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Summary:Present work investigates the influence of pre-strain on the limiting strains in sheet metal forming, using the strain gradient evolution model that predict the onset of local necking from initial thickness imperfections, roughness waviness and thickness gauge. The theoretical analysis is compared with the experimental results for fully annealed and three pre-strain levels of 4%, 8% and 12% in 2024 aluminium alloy sheet with thickness of 2.5 mm presented by Leacock et al. at ESAFORM 2008. The effect of strain and strain rate hardening behaviour, pre-strain and anisotropy parameters in material formability are analyzed. The experimental forming limit curves indicate an immediate drop in the limiting strains in the pre-strained specimen when compared with the full annealed condition material as expected from the theoretical prediction by a new model. Other relevant aspects of the new approach to modeling FLC are also discussed.
ISSN:1960-6206
1960-6214
DOI:10.1007/s12289-009-0587-5