| 초록 |
AA5182-polypropylene sandwich sheet was manufactured, and the mechanical properties evaluation was executed in order to identify Lüders band that causes fabrication process problem and especially surface roughness. To identify formability, deformation behavior, plastic strain ratio (R-value) and pole figure were measured, and texture analysis was performed. In the case of sandwich sheet, the unstable deformation behavior has decreased. As well, for sandwich sheet, Al skin could manage the most of load, and the elongation has improved about 45% more than that of Al skin. The plastic strain ratio of Al skin and sandwich panel, which indicates serration behavior, was obtained from instantaneous plastic strain ratio evaluation. Also, the planar anisotropy of sandwich sheet has decreased more than that of Al skin. According to these results, the sandwich sheet produced lightening effect and could control unstable deformation characteristic, that is, surface roughness caused by Lüders band. Furthermore, it was proved that the texture control of the rolling attachment of Al skin is necessary to improve the formability of the sandwich panel. |
