Surface Roughening and Formability in Sheet Metal Forming of Polycrystalline Metal

Abstract:

The r–value is defined as the ratio of the width strain to the thickness strain under the uniaxial tensile test of the sheet metal. Based on r-value of grains, a model of plastic deformation of polycrystalline metal and surface roughening after plastic deformation was proposed in the previous paper. Meanwhile, Marciniak and Kuczynski proposed the so-called M-K model which give the analytical estimation of the formability of sheet metal under biaxial stretching considering a certain irregularity of the thickness of the sheet metal. Yamaguchi et al showed that the experimentally measured surface roughness may correspond to the surface irregularity suggested in the M-K model. In the present paper, the formability of sheet metal under biaxial stretching is analyzed based on the previous analysis of surface roughening caused by the difference of the r-value in the sheet metal.

• Periodical: Key Engineering Materials (Volumes 535-536)
• Pages: 231-234
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.535-536.231
• Online since: January 2013
• Authors: Takeji Abe
• Keywords: Formability, Plastic Deformation, Polycrystalline Sheet Metal, R-Value, Surface Roughening

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