Title: Detailed experimental and numerical analysis of a cylindrical cup deep drawing: pros and cons of using solid-shell elements,
Abstract: The Swift test was originally proposed as a formability test to reproduce the
conditions observed in deep drawing operations. This test consists on forming a
cylindrical cup from a circular blank, using a flat bottom cylindrical punch
and has been extensively studied using both analytical and numerical methods.
This test can also be combined with the Demeri test, which consists in cutting
a ring from the wall of a cylindrical cup, in order to open it afterwards to
measure the springback. This combination allows their use as benchmark test, in
order to improve the knowledge concerning the numerical simulation models,
through the comparison between experimental and numerical results. The focus of
this study is the experimental and numerical analyses of the Swift cup test,
followed by the Demeri test, performed with an AA5754-O alloy at room
temperature. In this context, a detailed analysis of the punch force evolution,
the thickness evolution along the cup wall, the earing profile, the strain
paths and their evolution and the ring opening is performed. The numerical
simulation is performed using the finite element code ABAQUS, with solid and
solid-shell elements, in order to compare the computational efficiency of these
type of elements. The results show that the solid-shell element is more
cost-effective than the solid, presenting global accurate predictions, excepted
for the thinning zones. Both the von Mises and the Hill48 yield criteria
predict the strain distributions in the final cup quite accurately. However,
improved knowledge concerning the stress states is still required, because the
Hill48 criterion showed difficulties in the correct prediction of the
springback, whatever the type of finite element adopted.