A generalized isotropic yield criterion of the form,  
(σ1σ2)n+(σ2σ3)n+(σ1σ3)n21/n
 
=Y
where σ1 ≥ σ2 ≥ σ3 and 1 ≤ n ≤ ∞, is proposed. The corresponding flow rules, Lode variables, and effective strain functions are presented. Experimental and theoretical data on yielding under combined stresses can be described by a single parameter, n.
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