Question

The relationship between Young’s modulus (Y), Bulk modulus (K) and Poisson’s ratio (μ) is _____________

(a) Y=K(1-2μ)

(b) Y=3K(1-2μ)

(c) Y=5K(1-2μ)

(d) Y=4K(1-8μ)

This question was addressed to me in examination.

My enquiry is from Motors Rating and Heating topic in division Rating and Heating of Motors of Electric Drives

Answer 1

Right choice is (b) Y=3K(1-2μ)

To elaborate: The relationship between Young’s modulus (Y), Bulk modulus (K) and Poisson’s ratio (μ) is Y=3K(1-2μ). The Young modulus of elasticity is defined as the ratio of Longitudinal stress and Longitudinal strain.