Optimal Postbuckling Design of Variable Angle Tow Composite Plates

Raju, Gangadharan and Wu, Zhangming and White, Simon and Weaver, Paul M (2018) Optimal Postbuckling Design of Variable Angle Tow Composite Plates. AIAA Journal. pp. 1-17. ISSN 0001-1452

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Perturbation-based approximation methods are widely used in preliminary design studies of thin-walled structures. In this paper, postbuckling analysis of a variable-angle-tow composite plate is performed using the perturbation-based asymptotic numerical method, which transforms the nonlinear problem into a set of well-posed recursive linear problems. These linear problems are solved using a novel generalized differential-integral quadrature method, and the postbuckling solutions are sought over a finite load step size around the critical buckling point using asymptotic expansions. The accuracy of the asymptotic numerical method in evaluating the initial postbuckling of variable-angle-tow plates under compression is investigated. Subsequently, a novel postbuckling optimization approach based on asymptotic numerical method results is proposed for the design of variable-angle-tow laminates. The postbuckling features obtained from asymptotic numerical method are used in an efficient two-level optimization framework for the design of variable-angle-tow plates. At the first level, a globally convergent method of moving asymptotes is adopted to determine the optimal lamination parameter distributions that maximize the postbuckling performance of the variable-angle-tow plate. At the second level, a genetic algorithm is used to convert the optimal lamination parameter distributions into realistic variable-angle-tow layups. The optimization studies are performed for square variable-angle-tow plates for axial/biaxial compression under different in-plane boundary conditions.

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IITH Creators:
IITH CreatorsORCiD
Raju, GangadharanUNSPECIFIED
Item Type: Article
Subjects: Others > Metallurgy Metallurgical Engineering
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 25 Apr 2018 12:00
Last Modified: 25 Apr 2018 12:00
URI: http://raiith.iith.ac.in/id/eprint/3886
Publisher URL: http://doi.org/10.2514/1.J056043
OA policy: http://www.sherpa.ac.uk/romeo/issn/0001-1452/
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