Deep drawing behaviour of ultrafine grained copper: modelling and experiment |
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Authors: | X Ma R Lapovok C Gu A Molotnikov Y Estrin E V Pereloma C H J Davies P D Hodgson |
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Affiliation: | (1) Centre for Material and Fibre Innovation, Deakin University, Geelong, VIC, 3217, Australia;(2) Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia;(3) CSIRO Division of Materials Science and Engineering, Clayton, VIC, Australia;(4) School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia |
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Abstract: | Ultrafine grained materials produced by severe plastic deformation methods possess attractive mechanical properties such as
high strength compared with traditional coarse grained counterparts and reasonable ductility. Between existing severe plastic
deformation methods the Equal Channel Angular Pressing is the most promising for future industrial applications and can produce
a variety of ultrafine grained microstructures in materials depending on route, temperature and number of passes during processing.
Driven by a rising trend of miniaturisation of parts these materials are promising candidates for microforming processes.
Considering that bi-axial deformation of sheet (foil) is the major operation in microforming, the investigation of the influence
of the number of ECAP passes on the bi-axial ductility in micro deep drawing test has been examined by experiments and FE
simulation in this study. The experiments have showed that high force was required for drawing of the samples processed by
ECAP compare to coarse grained materials. The limit drawing ratio of ultrafine grained samples was in the range of 1.9–2.0
with ECAP pass number changing from 1 to 16, while a higher value of 2.2 was obtained for coarse grained copper. However,
the notable decrease in tensile ductility with increase in strength was not as pronounced for bi-axial ductility. The FE simulation
using standard isotropic hardening model and von Mises yielding criterion confirmed these findings. |
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