Buckling Optimization of Laminate Stacking Sequence with Strain Constraintsby S. Nagendra, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,
R. T. Haftka, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,
Z. Gürdal, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,
Abstract: An integer programming formulation for the design of symmetric and balanced composite laminates subject to buckling and strain constraints is presented. The design variables that define the stacking sequence of the laminate are ply-identity zero - one integers. The buckling constraint is linear in terms of the ply-identity design variables, but strains are nonlinear functions of these variables. A linear discrete approximation is developed for the strain constraints so that the problem can be solved by sequential linearization using the branch and bound algorithm. Examples of graphite-epoxy plates under biaxial compression are presented.
Subject Headings: Laminated materials | Buckling | Strain | Linear functions | Computer programming | Symmetry | Approximation methods
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