A thin cylindrical shell of diameter 'd', length 'l' and thickness 't' is subjected to an axial or internal pressure 'P'. What is the ratio of longitudinal strain to hoop strain in terms of Poisson's ratio (1/m)
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Hoop stress is always twice the longitudinal stress in a thin cylinder.
Using this ratio ($\sigma_{\text{h}} = 2\sigma_{\text{l}}$) makes it easy to derive the strain expressions quickly during examinations.