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The EI value is the the relationship between design of a shape and the strength of the material the shape is to be produced out of.
E = Modulas of Elasticity
I = Inertia Value
For example if a two tubes of the same diameter and wall thickness, one made from Aluminium and one made from Steel, the Steel tube will be stronger. The inertia value of the tube will be the same, but when multiplied by the Modulas of Elasicity the steel one will be significantly higher.
Modulas of Elasticity of Aluminium T6-6063 = 65500N/mm2
Modulas of Elasticity of Steel (Mild) = 205000N/mm2
Approx Figures.
EI Values are commonly used for calculating deflection amounts for self supporting glazing bars and lintels etc.
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