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Upper panel: axial and radial stresses derived by eqs 10 and 13 and set to zero stress at vacuum conditions. Lower panel: axial and radial strains derived from the stresses in the upper panel for the single cylindrical tube (eqs 14 and 15) and the FEM model (Figure 3) each multiplied by the Young’s modulus E. For both models, the Poisson’s ratio of the nonporous solid backbone was set to ν = 0.2.
