Weight and Cost Optimization of Hydrostatically Loaded Stiffened Flat Plates

[+] Author and Article Information
R. J. McGrattan

Electric Boat Division of General Dynamics

J. Pressure Vessel Technol 107(1), 68-76 (Feb 01, 1985) (9 pages) doi:10.1115/1.3264408 History: Received July 10, 1984; Revised October 09, 1984; Online November 05, 2009


Plates with longitudinal or orthogonal tee-stiffeners subjected to differential pressure are used in many structures. Equations to achieve minimum weight and cost are presented. Energy methods and plate gridwork theory are used. The accuracy of the technique is verified for typical designs by excellent comparison with stresses calculated by finite-element analysis. Minimum weight and cost studies using an optimization program are presented. Numerous small stiffeners minimize weight, whereas fewer, large stiffeners minimize cost. Fifteen independent structural variables are used for orthogonally stiffened plates. Stress, deflection, stability, and minimum thickness constraints are applied. Rapid optimum designs are achieved economically.

Copyright © 1985 by ASME
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