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Improved exact strip postbuckling analysis of anisotropic plate with combined load and edge cases

Che, Bin 2012. Improved exact strip postbuckling analysis of anisotropic plate with combined load and edge cases. PhD Thesis, Cardiff University.
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Abstract

Minimisation of the mass of aerospace structures has been investigated by researchers and designers for many years. It is an efficient means to reduce the manufacturing costs, fuel consumption and environmental impact. To achieve this objective, high performance composite ma- terials and optimised configurations are utilised in modern aircraft design. Additionally, use of the postbuckling reserve of strength has been considered during the preliminary design stage to obtain more e�cient structures. The exact strip analysis and optimum design software VICONOPT has been developed and used in postbuckling analysis. VICONOPT is able to give a good initial evaluation of load versus end shortening when compared with experimental and �nite element results. However it provides poor predictions of the stress and strain distributions in the postbuckling range. This is due to its assumptions concerning the longitudinal invariance of stress and the sinusoidal variation of buckling modes in the longitudinal direction. These assumptions are appropriate for initial buckling analysis but they limit the accuracy of subsequent postbuckling analysis. This thesis outlines some developments which improve the existing exact strip postbuckling analysis by improving the accuracy of mode shape prediction and stress and strain distributions. Based on pre- vious research by Von K�arm�an, improved governing equations are derived and solved for general anisotropic plates with di�erent in- plane edge conditions. Implementation of the improved analysis in VICONOPT enhances the accuracy of mode shapes and stress and strain distributions in the postbuckling analysis.

Item Type: Thesis (PhD)
Status: Unpublished
Schools: Engineering
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Uncontrolled Keywords: Postbuckling analysis; Anisotropic plates; Composite material; VICONOPT; Exact strip analysis; Aerospace structure
Date of First Compliant Deposit: 30 March 2016
Last Modified: 19 Mar 2016 23:34
URI: http://orca-mwe.cf.ac.uk/id/eprint/56759

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