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- W2009214476 abstract "In sheet-metal forming processes, the material is subjected to complex strain histories. The r-value is usually seen an inherent material character as the yield stress, work-hardening exponent n. It is common to characterize a material by an average r-value, r=(r0 + r9 0 + 2r4 5)/4, Δ r = (r0 + r9 0 −2r4 5)/2. The low-carbon steel sheet has been subjected to two-stage straining. The experimental results show that in the tensile test without pre-strain the r values obtained along the direction of 0, 45, 90 and −45 degrees with the rolling direction are about the same, but the Δ r values are different. In the two-stage straingin, for different direction of the planar shear pre-strain, in the subsequent tensile test the r and Δ r values obtained along 0, 45, 90 and −45 degrees with respect to the rolling direction show a significant difference, for example when λ = 45° r=2.083 and 1.606 respectively obtained along 0 and 90 with respect the rolling direction. The conclusion is that, taking r and Δ r values as the inherent material characters are not very suitable, it is dependent on the strain histories and the deformation direction of the materials." @default.
- W2009214476 created "2016-06-24" @default.
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- W2009214476 date "1995-01-01" @default.
- W2009214476 modified "2023-10-18" @default.
- W2009214476 title "Experimental investigation of the r and Δr value in A–K sheet subjected to two-stage straining" @default.
- W2009214476 cites W1595283676 @default.
- W2009214476 doi "https://doi.org/10.1016/0924-0136(94)01642-e" @default.
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