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Question
In terms of bulk modulus (k) and modulus of rigidity (c), the Poisson's ratio can be expressed as
A.
B.
C.
D.
Answer ( Option C)

Solution

The relation between elastic constants E, K, C, and Poisson’s ratio (m) comes from two

standard formulas:

E = 3K (1-2μ)     …(i)

E = 2C (1+μ)      …(ii)

Derivation:

Since both expressions equal E, equate them:

E = 3K (1-2μ) = 2C (1+μ)

3K - 6Kμ = 2C + 2Cμ

3K - 2C = μ (6K + 2C)

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