Poisson''s ratio (μ) is defined as the ratio of:
Choose the correct answer
Longitudinal strain to shear strain
Lateral strain to longitudinal strain
Shear stress to normal stress
Volumetric strain to linear strain
Correct Answer
B. Lateral strain to longitudinal strain
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Poisson''s ratio μ = lateral strain / longitudinal strain (both taken as positive values). When a bar is stretched longitudinally, it contracts laterally. For steel μ ≈ 0.3; for concrete μ ≈ 0.15–0.20. Theoretical range: 0 ≤ μ ≤ 0.5 (incompressible material μ = 0.5).
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