Method of strength analysis for doubly-curved stiffened orthotropic shells by various strength theories

The paper proposes a method of strength analysis for materials of thin-walled shell structures reinforced with stiffeners. The shells under consideration were made of orthotropic materials. The authors analyze the applicability of the following seven strength criteria: the maximum stress criterion, the Mises-Hill criterion, the Fisher criterion, the Goldenblatt-Kopnov criterion, the Liu-Huang-Stout criterion, the Tsai-Wu criterion, and the Hoffman criterion. During the study, doubly-curved shallow shells square in the plan were considered. A geometrically nonlinear mathematical model of shell deformation, which considers transverse shears, was used. The calculations were based on the characteristics of T10/UPE22-27 glass-fiber-reinforced plastic. The method relies on calculating the values of several strength criteria at each step of structural loading and analyzing the development of areas failing to meet the strength conditions as the load increases.