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

Download

index.pdf

Date

2012

Author

Namdar, Ömer

Metadata

Show full item record

Item Usage Stats

237
views

146
downloads

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

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Snap-through buckling analyses of composite shallow spherical shells Akkas, N; Toroslu, R (1999-10-01) The purpose of this work is to present some numerical results on nonlinear, snap-through buckling of shallow spherical shells made of laminated composite materials under general static loading. Isotropic shells are covered as a special case of the general problem. A special-purpose finite-difference computer program has been developed. Moreover, the general-purpose computer program ANSYS has also been used. Effects of various material properties on the nonlinear behavior of the shells are investigated. One ...
Buckling, postbuckling and progressive failure analyses of composite laminated plates under compressive loading Namdar, Omer; Darendeliler, Haluk (Elsevier BV, 2017-07-01) In this study, buckling, post-buckling and progressive failure of composite laminated plates have been investigated numerically and experimentally. Buckling load, load-displacement relations for post buckling and maximum out-of-plane displacements of the plates are determined. Furthermore, the numerical results are compared with experimental findings for two different laminates made of woven fabric and uni-directional tapes. The comparisons show that there is a good agreement between numerical and experimen...
Improving the strength of additively manufactured objects via modified interior structure Al, Can Mert; Yaman, Ulaş; Department of Mechanical Engineering (2018) This thesis study provides an approach to improve the durability of additively manufactured parts via modified interior structures by considering the stress field results from tensile loading conditions. In other words, the study provides an automated method, i.e., implicit slicing method, which improves the strength of the parts with infill structures modified according to the quasi-static Finite Element Analysis (FEA) results under tensile loadings, automatically. The parts which are used throughout the w...
Buckling of cross-ply laminated beams with arbitrary boundary conditions Khdeir, AA; Reddy, JN (1997-01-01) Analytical solutions of refined beam theories are developed to study the buckling behaviour of cross-ply rectangular beams with arbitrary boundary conditions. The state space concept in conjunction with Jordan canonical form will be used to solve exactly the governing equations of the buckling problems. The correlation between different shear deformation theories and the classical theory has been established. (C) 1997 Elsevier Science Ltd.
Numerical investigation of stiffened composite panel into buckling and post buckling under combined loading Akay, Erkan; Yaman, Yavuz; Department of Aerospace Engineering (2015) This thesis presents the investigation of buckling and post buckling behaviour of stiffened thin walled laminated composite aerospace structures subjected to combined in-plane axial and shear loadings. Due to the fact that the state of stress developing especially in the post-buckling stage is quite complicated under the combined loading, the necessary computational model is usually based on Finite Element Modelling (FEM). In this study, after verifying the FEM methodology and completing the sensitivity stu...

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.