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Exact strip analysis and experiments on buckling and post-buckling of plates and stiffened panels with mode jumping

Al-Saymaree, Muthana 2019. Exact strip analysis and experiments on buckling and post-buckling of plates and stiffened panels with mode jumping. PhD Thesis, Cardiff University.
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Abstract

Engineering components consisting of plated structures subjected to in plane loading can potentially fail due to buckling. This work focuses on presenting novel approaches to enhance the buckling and post-buckling behaviour of flat plates and stiffened panels made with metal and composite materials under in-plane loading conditions. A better understanding of post-buckling behaviour, including the phenomenon of mode jumping, will lead to improvements in both design criteria and manufacturing processes. The first part of this thesis describes an extensive study using the exact finite strip computer program VICONOPT and the finite element method to investigate the buckling of simply supported composite plates under different in plane loads. This approach utilises the lamination parameters to enhance the buckling capacity through the anisotropic properties of the laminate. Numerical relationships are presented as an optimisation procedure to maximise the buckling load under in plane uniaxial compression, shear or a combination of both. The procedure is applied to a series of anisotropic symmetric and balanced laminates with varying thickness and aspect ratios. The second part presents a numerical and experimental study to explore the post-buckling phenomenon of mode jumping phenomenon in plates and stiffened panels. The VICONOPT post-buckling analysis is extended to predict mode jumping, and the resulting numerical investigations are validated by finite element analysis. Furthermore, a series of experimental tests have been devised to investigate the buckling, post-buckling and mode jumping behaviour of curved stiffened panels with different radii of curvature. The experimental results are compared with finite element results in order to examine the similarities and differences between simulations and real behaviour of panels under compressive load.

Item Type: Thesis (PhD)
Status: Unpublished
Schools: Engineering
Uncontrolled Keywords: Buckling and Post buckling; Mode jumping; Exact strip method; VICONOPT software; Anisotrophy properties; Buckling mode shape.
Date of First Compliant Deposit: 25 September 2019
Last Modified: 23 Jul 2020 02:08
URI: http://orca-mwe.cf.ac.uk/id/eprint/125608

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