Ideal Moment of Inertia About y-Axis

I_{y} = \frac{\sum_{i = 1}^{n} (I_{y, i} \cdot E_{i})}{E_{ref}}

I_y	Moment of inertia about the y-axis
E_i	Modulus of elasticity of the material
E_ref	Modulus of elasticity of the reference material

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