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0 10 20 30 40 50 60 70 80 90
σ1u  
σ2u  
τ12u  


Maximum Stress Criterion

σ1 = σ1u

σ2 = σ2u

τ21 = τ12u

 

Tsai-Hill Criterion

\[{\left( {\frac{{{\sigma _1}}}{{{\sigma _{1u}}}}} \right)^2} + {\left( {\frac{{\sigma {}_2}}{{{\sigma _{2u}}}}} \right)^2} - \frac{{{\sigma _1}{\sigma _2}}}{{{\sigma ^2}_{1u}}} + {\left( {\frac{{{\tau _{12}}}}{{{\tau _{12u}}}}} \right)^2} = 1\]