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The basic assumptions of semi-moment theory Vlasov is summarized in the following: 1. The bending moment of the shell along logitudinal direction is zero. 2. The deformation in the cross direction is zero. Therefore torsion moment and also the cross force are neglected. It means that the bending here will be only in the cross direction of the tube. So there are following internal forces: axial forces and shear forces N, T, B, cross bending moment M and cross force Q (Fig.1).

Some remarks on the computation via SAMCEF and the semi-moment theory for cylindrical shells