Weight efficiency of the anisogrid circular cylindrical shells exposed to transverse bending and internal pressure

Article

Published: 23.06.2025

Published in issue: #6(162)/2025

DOI:

Category: Aviation and Rocket-Space Engineering | Chapter: Strength and Thermal Conditions of Aircraft

The paper presents results of studies obtained on the basis of a methodology developed by the author that implements the finite element method in solving the strength and stability problems of the reinforced cylindrical shells made of the composite material, taking into account their momentness and nonlinearity in the subcritical stress-strain state. The geometrically nonlinear stability problem is solved by the finite element method using the Newton—Kantorovich linearization. Critical loads are determined in the process of solving the nonlinear problem based on the Sylvester criterion. In solving the problem, finite elements of the composite cylindrical shells of natural curvature developed by the author based on the Timoshenko hypothesis are used. Their displacement approximation exactly identifies the rigid displacement positively effecting the solution convergence. The paper studies stability under the transverse bending with internal pressure provided by the anisogrid circular cylindrical shell. It demonstrates the influence of nonlinear deformation, internal pressure, reinforcement set stiffness, laying reinforcement angles and the shell thickness on the critical loads in losing the shell stability and weight efficiency while using the composite materials.

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