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Damage-tolerant design optimization of laminated composite structures using dispersion of ply angles by genetic algorithm

Gyan, Sonali and Ganguli, Ranjan and Naik, Narayana G (2012) Damage-tolerant design optimization of laminated composite structures using dispersion of ply angles by genetic algorithm. In: JOURNAL OF REINFORCED PLASTICS AND COMPOSITES, 31 (12). pp. 799-814.

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Official URL: http://dx.doi.org/10.1177/0731684412448104


This article aims to obtain damage-tolerant designs with minimum weight for a laminated composite structure using genetic algorithm. Damage tolerance due to impacts in a laminated composite structure is enhanced by dispersing the plies such that too many adjacent plies do not have the same angle. Weight of the structure is minimized and the Tsai-Wu failure criterion is considered for the safe design. Design variables considered are the number of plies and ply orientation. The influence of dispersed ply angles on the weight of the structure for a given loading conditions is studied by varying the angles in the range of 0 degrees-45 degrees, 0 degrees-60 degrees and 0 degrees-90 degrees at intervals of 5 degrees and by using specific ply angles tailored to loading conditions. A comparison study is carried out between the conventional stacking sequence and the stacking sequence with dispersed ply angles for damage-tolerant weight minimization and some useful designs are obtained. Unconventional stacking sequence is more damage tolerant than the conventional stacking sequence is demonstrated by performing a finite element analysis under both tensile as well as compressive loading conditions. Moreover, a new mathematical function called the dispersion function is proposed to measure the dispersion of ply angles in a laminate. The approach for dispersing ply angles to achieve damage tolerance is especially suited for composite material design space which has multiple local minima.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Sage Publication LTD
Keywords: Optimum weight design;dispersed ply angles;damage tolerance; genetic algorithm;failure criteria;dispersion function; finite element methods;matrix cracks;delamination
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 14 Jul 2012 07:54
Last Modified: 14 Jul 2012 07:58
URI: http://eprints.iisc.ac.in/id/eprint/44804

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