Determining the strain distribution in bonded and bolted/bonded composite butt joints using the digital image correlation technique and finite element methods

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TypeArticle
Proceedings titleConference Proceedings of the Society for Experimental Mechanics Series
Conference2011 SEM Annual Conference on Experimental and Applied Mechanics, 13 June 2011 through 16 June 2011, Uncasville, CT
ISSN2191-5644
ISBN9781461402275
Volume5
Pages401406; # of pages: 6
SubjectAircraft structure; Butt joints; Deformed images; Digital image correlation technique; Digital image correlations; Doublers; Finite element models; Flowthrough; Geometrically nonlinear; Hybrid joints; Metallic structures; Optical set-up; Strain distributions; Tensile loads; Thickness direction; Butt welding; Crack tips; Cracks; Finite element method; Image analysis; Optical data processing; Strain measurement; Strain
AbstractComposite primary and secondary aircraft structures have the potential to achieve the same strength and stiffness as conventional metallic structures, but at substantially lower weight. To accomplish this in an efficient and effective manner the joints used to attach these composite structures will be critical. This work investigated the strain distribution in adhesively bonded and hybrid bolted/bonded composite single-strap butt joints using a 2D digital image correlation (DIC) technique and geometrically nonlinear finite element modelling. A high magnification optical setup was used to measure the strains in the through thickness direction, allowing strain measurements in the region of the adhesive and along the bondline in the joint overlap section. This provided a detailed measure of strain flow through the adhesive and into the doubler and adherend under a maximum tensile load of 5338 N (1200 lbf). In all cases a crack developed at the inner overlap section in the hybrid joints and, using DIC techniques, the size of the crack as well as crack tip strains could be determined from the deformed images. The information obtained from the DIC measurements proved valuable in helping to improve the fidelity of the finite element model.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271205
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Record identifier8732bc73-404b-4605-b756-27c70f035058
Record created2014-03-24
Record modified2016-05-09
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