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Mechanical Engineering QUESTION #2507
Question 1
The neutral axis of a beam cross-section in pure bending is the axis about which:
  • Stress is maximum
  • The second moment of area is minimum
  • Bending strain and stress are zero — it passes through the centroid✔️
  • The shear stress is zero
Correct Answer Explanation
In pure bending, the neutral axis is the axis of zero longitudinal strain and stress. By the condition \(\int y\,dA = 0\) (from equilibrium), the neutral axis passes through the centroid of the cross-section.