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International Journal of Automotive Technology 2005;6(3): 259-268. |
| PLASTIC STRAIN RATIOS AND PLANAR ANIOSOTROPY OF AA5182/POLYPROPYLENE/AA5182 SANDWICH SHEETS |
| K. J. KIM |
| SsangYong Motors |
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| ABSTRACT |
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In order to analyze the sheet drawability, the measurement of the plastic strain ratio was carried out for the{{br}}5182 aluminum alloy sheets in which were cold rolled without lubricaton and subsequent recrystallization annealing. The average plastic strain ratio of the 5182 aluminum sheets was 1.50. It was considered that the higher plastic strain ratio was resulted from the ND// component evolved during rolling and maintained during annealing. The AA5182/polypropylene/AA5182 (AA/PP/AA) sandwich sheets of the 5182 aluminum alloy skin sheet and the polypropylene core sheet with high formability have been developed for application for automotive body panels in future light weight vehicles with significant weight reduction. The AA/PP/AA sandwich sheets were fabricated by the adhesion of the core sheet and the upper and lower skin sheets. The AA/PP/AA sandwich sheet had high plastic strain ratio (1.58), however, the planar anisotropy of the sandwich sheet was little changed after fabrication. The optimum combination of directionality of the upper and lower skin sheets having high plastic strain ratio and low planar anisotropy was calculated theoretically and an advanced process for producing the sandwich sheets with high plastic strain ratio was proposed. The developed sandwich sheets have a high average plastic strain ratio of 1.55 and a low planar anisotropy of 0.17, which was improved more by 3.2 times than that of 5182 aluminum single sheet. |
| Key Words:
Sandwich sheet, AA5182 skin, Texture, Plastic strain ratio, Drawability and planar anisotropy |
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