In a previous paper, the strain energy of a shell was derived with the aid of the assumption that only the linear terms in the thickness co-ordinate z need be retained in the expressions for the strains. Recently, Bleich and DiMaggio derived a strain-energy expression for circular cylindrical shells without using power series in z. The present paper shows that power series in z may be eliminated, in general, and that the errors caused by linearizing approximations are frequently significant.

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