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In principal stress space, this criterion takes the form of an irregular hexagonal cone. This criterion can be written in principal stresses as:

 

                             

where the principal stresses are given by:

 

                                               

and where the "mean" and "deviator" stresses are

 

                                                   

 

The invariants s and t are:

 

 

             

 

Substituting for and from (59) gives the function:

 

                 

The Tresca criterion is obtained from (63) by putting to give:

 

 

 

 

 

 

 

 

 

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