The need for weight reduction in the automotive industry has led to the development of aluminum alloys for body panels on a number of mass-produced vehicles 6xxx sene alloys are selected for outer panels. These panels are often joined to inner panels by hemming. Further weight saving of body panels requires the use of high strength aluminum alloys. The macroscopic defects observed in hemming have been described by several authors. Increased strength is generally associated to lower ductility which may lead to a poor surface aspect after hemming. The surface cracks are often associated with shear bands and cavitation. In the present work the bendability of four 1 mm thick 6xxx serie alloy sheets (6xxa-6xxd) has been analyzed for three different heat treatments. The deformation mechanism, determining the bendability, is described in terms of through thickness strain heterogeneity and grain structure evolution.
Hemming of aluminum automotive sheet
Falzen von Automobil-Aluminiumblech
2008
7 Seiten, 8 Bilder, 13 Quellen
Conference paper
English
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