First slide

Elastic Modulie

Question

If Poisson’s ratio of a material is 0.3, the ratio of its bulk modulus of elasticity of modulus of rigidity is

Moderate

A

1.52
B

0.86
C

1.26
D

1.66

Solution

$Y = 3 k (1 - 2 σ) = 2 η (1 + σ)$
$\Rightarrow \frac{k}{η} = \frac{2 (1 + σ)}{3 (1 - 2 σ)} = \frac{2 (1 + 0 .3)}{3 (1 - 2 \times 0 .3)} = 1 .6$

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