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In the formula (σI)net=σI-μσc, what is µ?

(a) Yield point

(b) Hoop constant

(c) Stress constant

(d) Poisson’s ratio

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The correct choice is (d) Poisson’s ratio

Easy explanation: μ is Poisson’s ratio, it is the ratio of transverse contraction strain to the longitudinal extension strain. σI is the longitudinal stress and σc is the circumferential stress.

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