Buckling and postbuckling analysis of delaminated beams under compressive loads
Lim, Yeow Beng
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Permalink
https://hdl.handle.net/2142/22788
Description
Title
Buckling and postbuckling analysis of delaminated beams under compressive loads
Author(s)
Lim, Yeow Beng
Issue Date
1994
Doctoral Committee Chair(s)
Parsons, I. Dennis
Department of Study
Civil and Environmental Engineering
Discipline
Civil and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
Two different studies are carried out to understand the influence of geometric parameters on the buckling behavior of a delaminated beam. In the first part, a simple model for predicting the linearized buckling of a composite beam with multiple delaminations is described. The study employs an energy method and arbitrary assumed displacements. Lagrange multipliers are used to enforce the kinematic constraints and boundary conditions, enabling a variety of support conditions to be studied.
In the second part of the study, a finite element approach is used to study the postbuckling behavior of a beam with a single delamination. In this study, we assembled a beam element and computational techniques developed by other researchers into a computer code. A two node finite deformation beam element is used, and the equilibrium path is traced by an arc-length method. Constraints in the form of nonlinear springs are enforced to prevent the beam surfaces from overlapping. The postbuckling characteristics of a perfect structure are followed by a branch switching procedure. Initial imperfections in the form of a small percentage of the first mode and/or the second mode are added to the original perfect structure. The imperfection sensitivity of the structure and possible mode interactions are studied by performing non-linear analysis.
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