Effect of Interface Friction on Overlapping Sheets Bulging Formability and Microstructure of 5A02 Aluminum Alloy

Abstract

Aluminum alloy 5A02 with low plasticity was used as target sheet, and stainless steel SUS304 with good plasticity was used as overlapping sheet to investigate the effect of interface friction on bulging formability and microstructure of target sheet in overlapping sheets bulging process. Sheet sliding experiment was performed to measure interface friction coefficient of 5A02/SUS304 in different lubricating conditions and normal pressure. Overlapping sheets bulging experiment of 5A02/SUS304 was carried out to investigate the influence of interface friction on limit bulging height, wall thickness distribution, microstructure and fracture morphology of 5A02 bulging specimens. The results showed that increase of the interface friction coefficient of 5A02/SUS304 could effectively improve the limit bulging height and deformation uniformity of 5A02. And the fracture style of 5A02 transformed from toughness fracture of dimples-micropores gathered to fault slip separation fracture. Therefore, target sheet bulging formability is improved with the increase of interface friction coefficient.

Keywords

overlapping sheets forming / friction coefficient / formability / microstructure

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