Buckling, postbuckling and progressive failure anaylses of composite laminated plates under compressive loading

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2012

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Namdar, Ömer

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The aim of this thesis is to investigate buckling, post-buckling behaviors and failure characteristics of composite laminated plates under compressive loading with the help of finite element method and experiments. In the finite element analyses, eigen value extraction method is used to determine the critical buckling loads and nonlinear Riks and Newton-Raphson methods are employed to obtain post-buckling behaviors and failure loads. The effects of geometric imperfection amplitude on buckling and post-buckling are discussed. Buckling load, post buckling loaddisplacement relations, out of plane displacements and end shortening of the plates are determined numerically. Furthermore, the numerical results are compared with experimental findings for two different laminates made of woven fabric and unidirectional tapes where buckling, post-buckling behavior and structural failure of laminated plates were determined. The comparisons show that there is a good agreement between numerical and experimental results obtained for buckling load and post-buckling range. However, 15 % - 22 % differences are predicted between the experimental and numerical results for failure of laminates made of woven fabric whereas the laminates with uni-directional tapes show good agreement.

Subject Keywords

Buckling (Mechanics)., Composite materials., Laminated materials., Materials, Strains and stresses.

URI

http://etd.lib.metu.edu.tr/upload/12614924/index.pdf
https://hdl.handle.net/11511/21792

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ö. Namdar, “Buckling, postbuckling and progressive failure anaylses of composite laminated plates under compressive loading,” M.S. - Master of Science, Middle East Technical University, 2012.