The paper proposes a method of strength analysis for materials thin-walled shell structures reinforced with stiffeners. shells under consideration were made orthotropic materials. authors analyze the applicability following seven criteria: maximum stress criterion, Mises-Hill Fisher Goldenblatt-Kopnov Liu-Huang-Stout Tsai-Wu and Hoffman criterion. During study, doubly-curved shallow square in p...

Much work has been done in topology optimization of multiscale structures for maximum stiffness or minimum compliance design. Such approaches date back to the original homogenization-based by Bends{\o}e and Kikuchi from 1988, which lately revived due advances manufacturing methods like additive manufacturing. Orthotropic microstructures locally oriented principal stress directions provide highl...

The paper presents a simple and efficient method for identifying two-parametric isotropic pressure-independent yield criteria. experimental procedure includes the upsetting of three types specimens. cylinders rings is used to evaluate effect friction. Together with plane strain compression in die, these tests provide two points locus on π-plane. conjunction plasticity theory based Hosford’s cri...

In this paper, considering symmetric collapse mode for hybrid tubes, and using Tsai-Hill fracture criterion to take into account the off-axis strength of an orthotropic lamina, an analytical model is extended and an expression is derived for mean crushing load and fold lengths of circular hybrid tubes. In this model, the influences of the geometrical dimensions including diameter, thickness of ...