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Optimal postbuckling design of variable angle tow composite plates

Raju, Gangadharan, Wu, Zhangming, White, Simon and Weaver, Paul 2018. Optimal postbuckling design of variable angle tow composite plates. AIAA Journal 56 (5) , pp. 2045-2061. 10.2514/1.J056043

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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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: American Institute of Aeronautics and Astronautics
ISSN: 0001-1452
Date of First Compliant Deposit: 24 April 2018
Date of Acceptance: 30 December 2017
Last Modified: 27 Jul 2018 20:37

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