Minimum Weight Design of Laminated Composite Plates for Postbuckling Performance

[+] Author and Article Information
Dong Ku Shin, Zafer Gürdal, O. Hayden Griffin

Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg VA 24061-0219

Appl. Mech. Rev 44(11S), S219-S231 (Nov 01, 1991) doi:10.1115/1.3121359 History: Online April 30, 2009


Minimum-weight design of simply-supported, symmetrically laminated, thin, rectangular, specially orthotropic laminated plates for buckling and postbuckling strength is investigated. The postbuckling analysis is based on an Marguerre-type energy method extended to generally orthotropic plates with a special consideration of the mode change in the postbuckling load regime. The failure load of laminates is calculated by the maximum strain failure criterion based on the in-plane strains. Design variables are individual layer thicknesses with specified fiber orientations and assumed to take only discrete values corresponding to multiples of the lamina thickness. The optimization with discrete valued design is achieved by introducing additional penalty terms, in the form of a sine function, to the regular pseudo-objective function of sequential unconstrained minimization technique (SUMT). The proposed optimization technique is applied to the design of rectangular laminates made up of 0, ± 45, 90 degree laminae with various aspect ratios loaded by axial compressive loads.

Copyright © 1991 by American Society of Mechanical Engineers
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