Measure of the plastic anisotropy of a rolled sheet metal
The Lankford coefficient (also called Lankford value, R-value, or plastic strain ratio)[1] is a measure of the plastic anisotropy of a rolled sheet metal. This scalar quantity is used extensively as an indicator of the formability of recrystallized low-carbon steel sheets.[2]
^Lankford, W. T., Snyder, S. C., Bausher, J. A.: New criteria for predicting the press performance of deep drawing sheets. Trans. ASM, 42, 1197–1205 (1950).
^Ken-ichiro Mori, Simulation of Materials Processing: Theory, Methods and Applications, (ISBN 9026518226), p. 436
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The Lankfordcoefficient (also called Lankford value, R-value, or plastic strain ratio) is a measure of the plastic anisotropy of a rolled sheet metal...
initial sheet thickness, t0 and the strain rate hardening coefficient, m. The lankfordcoefficient, r, which defines the plastic anisotropy of the material...
in the surface is much more pronounced than in the thickness. The lankfordcoefficient (r) is a specific material property indicating the ratio between...
_{1}-\sigma _{2}|^{m}-\sigma _{y}^{m}\leq 0\end{aligned}}} The R-value or Lankfordcoefficient can be determined by considering the situation where σ 1 > ( σ 2...
have potential industrial applications as properties such as the Lankfordcoefficient (important for deep drawing processes) and magnetic properties of...
determining the strain hardening exponent n, the anisotropy-values (lankfordcoefficient), as well as other tests for sheet metal formability and, later,...
and Technology. 167 (2–3): 129–13. doi:10.1016/S0257-8972(02)00898-8. J. Lankford, C. R. Blanchard, C. M. Agrawal, D. M. Micallef, G. Dearnaley and A. R...
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