Numerical investigation on a key factor in superior stretchability of face-centered cubic polycrystalline sheets

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• 作者：Kengo Yoshida ; ^{yoshida@yz.yamagata-u.ac.jp} ; Mitsutoshi Kuroda
• 关键词：Forming limit ; r-value ; Stretchability ; Polycrystalline sheet ; Crystal plasticity
• 刊名：International Journal of Mechanical Sciences
• 出版年：2012
• 期刊代码：85_00207403
• 类别：et
• 出版时间：May, 2012
• 卷：58
• 期：1
• 页码：47-56
• 文件大小：1439 K

摘要

Plastic deformation characteristics and limit strains are simulated for textured face-centered cubic polycrystalline sheets using a generalized Taylor-type crystal plasticity model. The r-values are predicted to be 1.04, 7.74, and 0.17 for the pseudo-random, {1 1 1}銆?em>uvw銆? and {0 0 1}銆?em>uvw銆?textures, respectively. The {1 1 1}銆?em>uvw銆?texture gives limit strains as large as the random texture, whereas the {0 0 1}銆?em>uvw銆?texture yields limit strains apparently higher than the other two, even though its r-value is extremely low. Thus, the r-value cannot act as an indicator of the stretchability of sheet metals. For the {0 0 1}銆?em>uvw銆?texture, a superior strain-hardening ability under the plane-strain stretching mode is found to be responsible for the increase in the limit strains under plane strain and equi-biaxial stretching modes. It is concluded that the enhancement of the strain hardening ability for the plane-strain stretching mode is one of the key factors of high stretchability sheets.