Equivalent Stress σ_v,Rankine,+ on Positive Surface Side

σ_{v, Rankine, +} = \frac{1}{2} |σ_{x, +} + σ_{y, +}| + \frac{1}{2} \sqrt{{(σ_{x, +} - σ_{y, +})}^{2} + 4 {τ_{xy, +}}^{2}}

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Equivalent Stress σv,Rankine,+ on Positive Surface Side