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Mechanical Engineering QUESTION #2501
Question 1
Poisson's ratio \(\nu\) is defined as the ratio of:
  • \(\text{Axial strain}/\text{Lateral strain}\)
  • \(\text{Lateral strain}/\text{Axial strain}\) (magnitude)✔️
  • \(\text{Shear strain}/\text{Normal strain}\)
  • \(\text{Normal stress}/\text{Lateral stress}\)
Correct Answer Explanation
Poisson's ratio: \(\nu = -\varepsilon_{lateral}/\varepsilon_{axial}\) (the negative sign makes \(\nu\) positive). For most metals, \(\nu \approx 0.25\text{–}0.35\).