In an earlier paper of the author  was given a simplified system of equations valid for a certain class of problems of the theory of elastic-plastic shells. The case of the steady-state creep of shells can be treated in a similar manner. The real shell of the thickness 2H is replaced by a sandwich model shell, the thickness of the layers being δ and the distance of them 2h.
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- Rabotnov, Yu. N.: An approximate technical theory of elastic-plastic shells. Prikl. mat. mekh. 15 (1951) No. 2.Google Scholar