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Mechanical Engineering QUESTION #2498
Question 1
In Mohr's circle for plane stress, the principal stresses \(\sigma_1\) and \(\sigma_2\) occur at points where:
  • The circle has maximum radius
  • The circle intersects the \(\sigma\)-axis (shear stress \(\tau = 0\))✔️
  • The shear stress is maximum
  • The normal stress equals the average stress
Correct Answer Explanation
Principal stresses are defined as the normal stresses acting on planes where shear stress is zero. On Mohr's circle, these correspond to the two points where the circle intersects the horizontal \(\sigma\)-axis (i.e., \(\tau = 0\)).