Talk:Hill yield criterion

Someone changed the criterion from

$F(\sigma _{22}-\sigma _{33})^{2}+G(\sigma _{33}-\sigma _{11})^{2}+H(\sigma _{11}-\sigma _{22})^{2}+2L\sigma _{23}^{2}+2M\sigma _{31}^{2}+2N\sigma _{12}^{2}=1$

to

$F(\sigma _{22}-\sigma _{33})^{2}+G(\sigma _{33}-\sigma _{11})^{2}+H(\sigma _{11}-\sigma _{22})^{2}+2L\sigma _{23}^{2}+2M\sigma _{31}^{2}+2N\sigma _{12}^{2}=2\sigma _{y}^{2}~.$

without making corresponding changes to the expressions for F, G, H, I, J, K. I'm reverting back the change. Bbanerje (talk) 03:38, 13 February 2009 (UTC)

Broken link

Link on bottom of article is broken (leads to University of navarra). — Preceding unsigned comment added by 194.114.62.74 (talk) 12:58, 29 November 2013 (UTC)