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Scale factor and punch shape effects on the expansioncapacities of an aluminum alloy during deep-drawing operations

Published online by Cambridge University Press:  22 April 2014

R. Boissiere ,
P. Vacher  and
J. J. Blandin
R. Boissiere*
Affiliation:
Institut Jean Lamour, Nancy University, 54000 Nancy, France
P. Vacher
Affiliation:
SYMME, Université de Savoie, 74944 Annecy-Le-Vieux, France
J. J. Blandin
Affiliation:
SIMAP-GPM2, Institut Polytechnique de Grenoble, 38402 Saint-Martin d’Hères, France
*
a Corresponding author:remi.boissiere@univ-lorraine.fr
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Abstract

The effects of punch geometry and sample size on forming limit diagrams in expansion areinvestigated in the case of a 2024 aluminium alloy. Four configurations were selected:flat punch (Marciniak test) or hemispheric punch and decimetric vs. centimetric toolingdimensions. Both decimetric and centimetric deep-drawing devices are associated with animage correlation tool that allows identifying without any contact the deformation on thesurface of planar or non-planar specimens. Strains on the surface of the samples areobserved by means of a double numerisation in three dimensions of the sample before andafter deformation by using stereoscopic vision and triangulation. Finally, deep-drawinglimit of the four configurations are compared in expansion state and with literature.Results mainly show that hemispherical punch allows measuring higher strains and is lesssensitive to size effect than Marciniak test.

Keywords

Deep-drawingformingaluminiumstrain3D digitisation
Type
Research Article
Information
Mechanics & Industry , Volume 15 , Issue 2 , 2014 , pp. 159 - 166
Copyright
© AFM, EDP Sciences 2014

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