Optimized shell of revolution with ribs: first buckling mode shape. Symmetry conditions are imposed at the large end. Buckling is between adjacent ribs near the large end.

FROM:
Pawel Forys (Institute of Applied Mechanics, Cracow University of Technology, Poland), “Optimal design of shells of uniform stability stiffened by ribs”, Mechanics and Mechanical Engineering, Vol. 17, No. 1, pp 37-47, 2013

ABSTRACT: The problem of optimal design of rotationally symmetrical shells of uniform stability stiffened by ribs was discussed in the current paper. The structure was modelled in ANSYS software and solved by FEM method. The formulation of uniform local stability was successfully verified by the linear buckling solution. The optimization tasks were solved numerically using the modified Particle Swarm Optimization algorithm. The critical loading multiplier was increased by determining the optimal shape of the meridian, distribution of a wall thickness in a coat of shell and the placement of ribs inside the shell.

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