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oai:www.ideals.illinois.edu:2142/22788 2023-07-10 col_2142_5131 col_2142_14770 com_2142_5130 com_2142_3518 com_2142_234

Parsons, I. Dennis Lim, Yeow Beng 2011-05-07T13:51:31Z 2011-05-07T13:51:31Z 10000-01-01 1994 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). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9416395.pdf: 6516014 bytes, checksum: df005477d0cf4248127f3cb6abbd0d9e (MD5) Previous issue date: 1994 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:00:00Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:28:21-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9416395 (UMI)AAI9416395 http://hdl.handle.net/2142/22788 eng Copyright 1994 Lim, Yeow Beng Engineering, Civil Buckling and postbuckling analysis of delaminated beams under compressive loads text Civil and Environmental Engineering Civil and Environmental Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.