Question

If the section modulus of a beam decreases then bending stress will

Answer 1

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Answer 2

Answer:

If the section modulus of a beam decreases then bending stress will increase.

Explanation:

• Bending Equation is given by

    $\frac{M}{I} =\frac{\sigma}{y}$

    Where M is Bending moment

     I is moment of Inertia

     σ is Bending Stress

     y is the distance from the neutral axis

• Bending Stress is given by

    ${\sigma}=\frac{M}{\frac{I}{y} }$

     ${\frac{I}{y}$ is called section modulus

• From the above formula, stress is inversely proportional to section modulus.
• Thus, If the section modulus of a beam decreases then bending stress will increase