Question

Based on flexural point, a beam can be considered as strongest due to:

• A. Maximum bending stress
• B. Maximum area of cross section
• C. Maximum section modulus
• D. Maximum moment of inertia

Hint:

To make a beam stronger, focus on increasing the section modulus, which improves the beam's ability to resist bending stress.

Answer 1

The Correct Option is C

Step 1: Understanding the Strength of a Beam
The strength of a beam in bending is often characterized by the bending stress, which is calculated as: \[ \sigma = \frac{M}{S} \] where \( M \) is the bending moment and \( S \) is the section modulus. The section modulus is a property of the beam's cross-sectional shape that determines the beam's resistance to bending.
Step 2: Flexural Strength Consideration
The strength of a beam under bending is influenced by how well the material resists bending stress. The section modulus \( S \) plays a critical role in this, as a larger section modulus allows the beam to resist greater moments before failing.
Step 3: Conclusion
The strongest beam is thus one that has the maximum section modulus, as this allows it to resist higher bending moments without failure.