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What is the correct sequence of the following metals in the decreasing order of their poisson's ratio -

(a) Aluminum (b) Cast iron (c) Steel


1. (b) - (a) - (c)
2. (c) - (a) - (b)
3. (a) - (b) - (c)
4. (a) - (c) - (b)

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Correct Answer - Option 4 : (a) - (c) - (b)

Explanation:

Poisson's ratio:

The ratio of lateral strain to the longitudinal strain is a constant for a given material. When the material is stressed within the elastic limit this ratio is called Poisson's ratio.

\(μ = \frac{{ - lateral\;strain}}{{longitudinal\;strain}}\)

In general, for engineering purpose value of Poisson's ratio vary from 0 to 0.5.

The value of μ for some important material is listed below;

Material Value of μ 
Cork 0
Concrete 0.1 to 0.2
Mild steel 0.286
Cast iron 0.23 to 0.27
Aluminum 0.33
Glass 0.05 to 0.1
Rubber 0.5

 

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