Effects of gaps and overlaps on the buckling behavior of an optimally designed variable-stiffness composite laminates - A numerical and experimental study

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DOIResolve DOI: http://doi.org/10.1016/j.compstruct.2016.01.012
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TypeArticle
Journal titleComposite Structures
ISSN0263-8223
Volume140
Pages556566; # of pages: 11
SubjectABAQUS; Buckling; Computer software; Finite element method; Laminates; MATLAB; Nonlinear analysis; Paper laminates; Stiffness; Composite laminate; Critical buckling loads; Fiber placement; Finite element simulations; Gaps/overlaps; Linear buckling analysis; Numerical and experimental study; Numerical investigations; Laminated composites; Composites; Fibers
AbstractThis paper reports an experimental and numerical investigation of the effects of gaps and overlaps on the buckling behavior of variable-stiffness composite laminates. In the experimental study, variable-stiffness composite laminates with a constant-curvature fiber path were manufactured and tested under uniaxial compression to failure with simply supported edges. The tested panels were optimized to simultaneously maximize the in-plane stiffness and the buckling load. Two manufacturing strategies - complete overlaps and complete gaps - were adopted to allow the independent effect of each type of defect to be investigated in isolation. In the numerical study, a two-dimensional finite element model was built using the commercial software Abaqus through a Python input script. A MATLAB routine was also implemented to localize the gaps and overlaps within the studied variable-stiffness laminates. A linear buckling analysis was performed to calculate the pre-buckling strength and the critical buckling load for each tested composite laminate. Thereafter, a nonlinear analysis using the Riks method was performed to predict the load-displacement relationship, considering the geometric imperfections of cured composite laminates. A good correlation was observed between the results obtained from the finite element simulations and from the experiments.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Aerospace
Peer reviewedYes
NPARC number21277434
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Record identifiera1dad797-c921-46b5-92d7-b527f11cd9be
Record created2016-03-09
Record modified2016-05-09
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