Investigation of the effects of geometric parameters of layers on the formability of Aluminum/Polyurethane/Aluminum sandwich sheets

Nowadays sandwich sheets with polymer core, have been replaced many applications of single-layer sheets in different industries. Complex behavior of sandwich sheets during deformation and their deformation limits, shows the need to review the formability of this sheets. This research discussed about analysis of effect of geometric parameters of sandwich sheet layers on formability of Aluminum/Polyurethane/Aluminum sandwich sheets. To evaluate the formability of sandwich sheets, the punch stretching test with a hemispherical punch was performed. Also, formability of these sheets obtained using finite element method. After verifying finite element model, it was observed that the difference between the output of the strain on the finite element method and experimental results was 7 to 15% which seems appropriate. The results of experimental method and finite element simulation showed that with increasing the core thickness of the sandwich sheet, the formability decreases. It was also proved that the arrangement of layers plays an important role in the formability of sandwich sheets.