Question

The product EI is known as-

(Where E - Modulus of Elasticity and I = Moment of Inertia)

1. Section modulus
2. Modulus of rupture
3. Flexural rigidity
4. Polar modulus

Answer 1

Correct Answer - Option 3 : Flexural rigidity

Concept:

We know that,

\(\frac{M}{I}=\frac{\sigma _{b}}{y}=\frac{E}{R}\)

And MR = EI 

where,R= Radius of curvature of beam, M = Bending moment, E = Yong’s modulus, I = Area moment of inertia,

Here, EI = Flexural rigidity

i.e. EI ∝ M

Flexural rigidity is a measure of the resistance of a beam to bending, that is, the larger the flexural rigidity, the smaller the curvature for a given bending moment.