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Analysis and design for the moderately deep postbuckling behavior of composite plates

Wu, Zhangming, Raju, Gangadharan and Weaver, Paul 2017. Analysis and design for the moderately deep postbuckling behavior of composite plates. Journal of Aircraft 54 (1) , pp. 327-335. 10.2514/1.C033875

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Abstract

It is widely acknowledged that tracking the postbuckling response of structures made from thin plates can be problematical. Such difficulty is associated with highly nonlinear effects, including mode jumping, imperfection sensitivity, and their combined interactions. Two widely used techniques that are currently used involve path following and asymptotic expansion. The former is often implemented in commercial finite element codes but can prove unreliable at representing branch switching. The latter is a relatively quick technique due to its recursive linear nature but is only reliable in the vicinity of bifurcations. Due to the overall complex nonlinearity, analytical closed-form solutions do not exist for path following and exist rarely for quadratic asymptotic expansions where simple forms have been adopted. This paper presents an analytical-based approach that enables the efficient optimal design of “moderately deep” nonlinear postbuckling behavior of laminated composite plates under uniaxial or biaxial loading. It provides a closed-form solution that more reliably reflects a deeper postbuckling response than the state of the art. Subsequently, highly efficient postbuckling optimization is attributed to the newly derived closed-form solution and a recent two-level optimization framework.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Publisher: The American Institute of Aeronautics and Astronautics (AIAA)
ISSN: 0021-8669
Date of First Compliant Deposit: 16 July 2016
Date of Acceptance: 18 May 2016
Last Modified: 20 Oct 2019 04:12
URI: http://orca.cf.ac.uk/id/eprint/92809

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