Topic: Strength of Materials
Elastic stress distribution in the cross section of a curved beam under pure bending is
- A. Linear
- B. Quadratic
- C. Parabolic
- D. Hyperbolic
Answer: D. Hyperbolic
Explanation: In a curved beam under pure bending, the stress distribution across the cross-section is not linear like in a straight beam. The formula $\sigma = \frac{my}{Ae(r-y)}$ indicates that the stress varies hyperbolically with respect to the distance from the neutral axis.