塑性と加工
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
論文
管・棒材の軸対称塑性異方性
北村 憲彦水野 高爾夏 国洋寺野 元規
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2011 年 52 巻 601 号 p. 272-276

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The theory and application of plastic anisotropy have extensively developed in the main field of sheet metal forming. Round tubes and bars are generally used for tube forming and forging; they exhibit plastic anisotropy similarly to sheets. In this paper, assuming that these materials show anisotropy with three cylindrical orthogonal symmetry axes, r, θ and z, we used the simple anisotropic criterion proposed by Hill in 1948 as follows: 2C2 = Fθ- σz)2 + Gz- σr)2 + Hr- σθ)2. In the tube materials, the ratios εθr = F/G and εθz = H/G are not necessarily equal to unity. For a tube of A6063 in JIS as an example, F/G = 0.55 and H/G = 0.69 were determined by a tube tensile test and a tube wall compression test, respectively. In the bar materials, we theoretically showed that anisotropy affects the mean stress in the tensile/compression test. Also, by a semi-cylinder compression test, for a round bar of A2017-F in JIS as an example, F/G = 0.37 was determined. Moreover, in the ring compression test for determining frictional coefficient, we found using FE analysis that anisotropy and friction affect the reduction in internal diameter.

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© 2011 一般社団法人 日本塑性加工学会
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