Membrane Equivalent Stress σ_v,Bach,m

σ_{v, Bach, m} = \max (\frac{1 - ν}{2} |σ_{x, m} + σ_{y, m}) + \frac{1 + ν}{2} \sqrt{(^{σ_{x, m} - σ_{y, m}) 2} + 4 {τ_{xy, m}}^{2}}; ν |σ_{x, m} + σ_{y, m})||)

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Membrane Equivalent Stress σv,Bach,m