Pastic Strain Ratio and Texture Evolution of Aluminum/Polypropylene/Aluminum Sandwich Sheets

알루미늄 5182-폴리프로필렌 샌드위치 판재의 소성변형비 및 집합조직의 발달

  • Kim, Kee-Joo (CAE Team, Ssangyong Motor Company) ;
  • Jeong, Hyo-Tae (Department of Metallurgical Engineering, Kangnung National University)
  • Published : 2006.03.01

Abstract

AA5182-polypropylene sandwich sheet was manufactured, and the mechanical properties evaluation was executed in order to identify $L{\ddot{u}}ders$ 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, A1 skin could manage the most of load, and the elongation has improved about 45% more than that of A1 skin. The plastic strain ratio of A1 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 A1 skin. According to these results, the sandwich sheet produced lightening effect and could control unstable deformation characteristic, that is, surface roughness caused by $L{\ddot{u}}ders$ band. Furthermore, it was proved that the texture control of the rolling attachment of A1 skin is necessary to improve the formability of the sandwich panel.

Keywords

References

  1. A. K. Vasudevan and R. D. Doherty, 'Aluminum Alloys-Contemporary Research and Applications,' pp.539-550, 1989
  2. E. W. Veenstra, 'Aluminum-Plastic-Aluminum Sandwich Sheet for Maximum Weight Reduction in Body Panels,' SAE 930706, 1993
  3. J. M. Robinson and M. P. Shaw, Mat. Sci & Eng., A159, pp.159-165, 1992
  4. D. S. Kim and K. S. Shin, 'Mechanical Properties of Aluminum Sandwich Panels,' Proc. of 4th Next Generation Vehicle Workshop, KATECH, pp. 459-465, 1996
  5. K. J. Kim and K. S. Shin, 'Characterization of Aluminum Sandwich Panels,' Proc. of 5th Next Generation Vehicle Workshop, KATECH, pp. 639-647, 1997
  6. K. J. Kim and K. S. Shin, 'Serration Behavior of AA5182/Polypropylene/AA5182.' Transactions of KSAE, Vol.12, No.3, pp.192-203, 2004
  7. K. J. Kim, 'Plastic Strain Ratios and Planar Anisotropy of AA5182/Polypropylene /AA 5182 Sandwich Sheets,' Int. J. Automotive Technology, Vol.6, No.3, pp.259-268, 2005
  8. H. T. Jeong and D. N. Lee, 'Variation in the Plastic Strain Ratio with Tensile Strain,' J. of Korean Inst. of Met. & Mater., Vol.35, No.5, pp.550-557, 1997
  9. H. J. Bunge, Texture Analysis in Materials Science, Translated by P. R. Morris, Butterworths, London, 1982