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)

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