Investigation of the stability of anisogrid circular cylindrical shells under combined loading by transverse force and internal pressure

The research results were obtained on the basis of a technique developed by the authors that implements the finite element method for solving problems of strength and stability of discretely reinforced cylindrical shells made of composite material, taking into account the momentarity and nonlinearity of their subcritical stress-strain state. The finite elements of cylindrical composite shells of natural curvature developed by the authors on the basis of the Timoshenko hypothesis are used, in approximating the displacements of which their rigid displacements (displacements of finite elements as a solid body) are explicitly highlighted. Critical loads are determined in the process of solving a geometrically nonlinear problem using the matrix triangulation method and the Sylvester criterion. The shapes of shells deformed in the subcritical state and their shapes with loss of stability are also calculated. The stability under transverse bending with internal pressure of an anisogrid circular cylindrical shell made of a composite material is investigated. The influence of the nonlinearity of deformation, the stiffness of the reinforcement set, the angles of laying reinforcements and the thickness of the shell and the internal pressure on the critical loads of the loss of stability of the shell has been clarified.
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