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Title: Multiobjective optimization of laminated plates for maximum prebuckling, buckling and postbuckling strength using continuous and discrete ply angles
Authors: Adali, Sarp 
Walker, Mark 
Verijenko, Viktor E. 
Issue Date: 1996
Publisher: Elsevier.
The optimal design of uniaxially loaded laminated plates subject to elastic in-plane restraints along the unloaded edges are given for a maximum combination of prebuckling stiffness, postbuckling stiffness and buckling load. The results are also obtained for biaxially loaded plates without elastic restraints. The method of solution involves defining a design index comprising a weighted average of the objective functions and identifying candidate configurations which have to be optimized and compared to determine the best stacking sequence. This multiobjective approach leads to improved prebuckling, buckling and postbuckling performance. A similar approach is adopted in the case of discrete ply angles with the provision that these angles can only take predefined values. From a manufacturing viewpoint, using only certain fibre orientations such as 0, ± 45 and 90 ° is advantageous and cost-effective. The multiobjective design results are compared to single objective ones, and the effect of various problem parameters on the optimal designs are numerically studied. It is observed that the resulting trade-off among the different objectives are not severe leading to well-balanced laminates with regard to the range of loads they are required to carry. A comparison of continuous and discrete optimization indicates that both designs lead to comparable load carrying capacity, with regard to different objectives
Originally published in: Composite Structures Vol. 35, No. 1, 1996.
DOI: 10.1016/0263-8223(96)00030-X
Rights: The electronic version of the article published in Composite Structures 1996, 35(1): 117-130 © 1996 copyright Elsevier. Composite Structures available online at:
Appears in Collections:Research Publications (Engineering and Built Environment)

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