{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22788"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22788","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Buckling and postbuckling analysis of delaminated beams under compressive loads","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. 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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.","Made available in DSpace on 2011-05-07T13:51:31Z (GMT). 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Dennis"],"dc:creator":["Lim, Yeow Beng"],"dc:date":["2011-05-07T13:51:31Z","10000-01-01","1994"],"dc:description":["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.","Made available in DSpace on 2011-05-07T13:51:31Z (GMT). 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