Abstract
In this research, the equivalent method and multi-failure mechanism of hierarchical Isogrid stiffened cylinders (HISCs) were investigated. Two-level homogenization technique was proposed to analyze the stiffness and stresses of the HISC. Five failure modes and criteria, including global buckling, primary mono-cell buckling, secondary mono-cell buckling, primary rib buckling and material failure were proposed to distinguish the failure mode and predict the load capacity. The method was verified by experimental and numerical investigations. The study deepens the understanding of controlling ability of hierarchical structures on buckling behaviors and predicting failure with properties approaching the actual performance, and gives a guidance to ultralight design of large-diameter lattice cylindrical shells with higher accuracy.
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