Comparison of surface strain for stamp formed aluminum and an aluminum-polypropylene laminate

The permanent strain on the surface of a channel-formed aluminum-polypropylene laminate was compared to monolithic aluminum. The materials used in this study were 5005-H34 aluminum and a self-reinforced polypropylene (Curv, BP). Microscopic examination of the sidewall edge, prior to taking the strain measurements, confirmed the absence of delamination. The results show that the aluminum-Curv laminate exhibits low strain and is not influenced by a change in tool radii, which makes it efficient to solve the problems associated with stamping of traditional monolithic metals