Characterising the behaviour of composite single lap bonded joints using digital image correlation

Three-dimensional and two-dimensional Digital Image Correlation (DIC) have been used to evaluate the evolution of deformation and strain in composite single lap bonded joints prior to failure. In general, composite components are increasingly being joined using structural adhesives for aerospace and...

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Bibliographic Details
Published inInternational journal of adhesion and adhesives Vol. 40; pp. 215 - 223
Main Authors Comer, A.J., Katnam, K.B., Stanley, W.F., Young, T.M.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.01.2013
Elsevier
Subjects
Applied sciences
Composites
Digital Image Correlation
Epoxy adhesives
Exact sciences and technology
Lap shear
Physicochemistry of polymers
Polymer industry, paints, wood
Stress analysis
Technology of polymers
Epoxy adhesives
Lap shear
Composites
Stress analysis
Digital Image Correlation
Lap joint
Epoxy resin
Mechanical properties
Polymer
Composite material
Surface deformation
Prepreg
Numerical simulation
Needled material
Damaging
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Summary:Three-dimensional and two-dimensional Digital Image Correlation (DIC) have been used to evaluate the evolution of deformation and strain in composite single lap bonded joints prior to failure. In general, composite components are increasingly being joined using structural adhesives for aerospace and other safety critical applications. Reliable design requires that the mechanical behaviour of composite bonded joints is well understood. In this respect, experimental tests are crucial to (a) characterise the deformation and strains induced under load and (b) develop and validate realistic numerical models. Although modern numerical models contain many degrees of freedom, only a few degrees of freedom are typically measured using conventional instrumentation such as strain gauges and extensometers. However, 3D DIC provides an opportunity to measure full-field deformations and surface strains. In the current study, 3D DIC was successfully used to measure full-field in-plane surface strains and out-of-plane surface deformations for composite single lap bonded joints (adherends manufactured from both fibre preimpregnated resin (pre-preg) and resin infused non-crimp-fabric (NCF)). Moreover, strategically located strain gauges were used to validate the strains measured by 3D DIC. Finally, 3D DIC measurements may be useful in detecting subcritical damage as shown in the case of the pre-preg joint. The specific location and magnitude of the maximum principal strain in the adhesive fillet region were determined using high magnification 2D DIC.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2012.08.010