In the case of plane stress, where the in-plane principal
Chapter 10, Problem 10-94(choose chapter or problem)
In the case of plane stress, where the in-plane principal strains are given by \(\epsilon_{1} \text { and } \epsilon_{2}\) , show that the third principal strain can be obtained from \(\epsilon_{3}=-[\nu /(1-\nu)]\left(\epsilon_{1}+\epsilon_{2}\right)\) where \(\nu\) is Poisson’s ratio for the material.
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