Using Digital Image Correlation Techniques for Damage Detection on Adhesively Bonded Composite Repairs

Caminero, M.A.; Pavlopoulou, S.; Lopez‐Pedrosa, M.; Nicolaisson, B.G.; Pinna, C.; Soutis, Constantinos

doi:10.1177/096369351202100203

Cited by 19 publications

(7 citation statements)

References 21 publications

(35 reference statements)

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“…Consequently the need to develop repair techniques and processes for composite parts should be readily apparent. Bonded patch repair techniques provide an alternative method to mechanically fastened joints for repairs with significantly higher performance, especially for relatively thin composite materials [1][2][3]. Properly designed patch bonding can lead to cost effective and highly efficient repairs in comparison with conventional mechanical joints that lead to failure of fibers and introduce highly strain regions [4].…”

Section: Introductionmentioning

confidence: 99%

Energy absorption of repaired composite laminates subjected to impact loading

Balaganesan

Khan

2016

Composites Part B: Engineering

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Section: Introductionmentioning

confidence: 99%

Energy absorption of repaired composite laminates subjected to impact loading

Balaganesan

Khan

2016

Composites Part B: Engineering

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“…21 Therefore, it is widely used as part of distinct types of mechanical tests, which in some of the cases the traditional contacting measurement methods are not capable. [21][22][23] The Arcan method is one of these types of test which could be enriched in association with DIC due to its capability to measure displacements in distinct orientations, thus being part of this study. [11][12][13] To the best of the author's knowledge, this testing methodology was not yet applied to FFF printed samples.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterisation of fused filament fabrication printed parts under tension, shear, and combined shear–tension loads via Arcan test

Ferreira

Jesus

Machado

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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The mechanical performance of fused filament fabrication printed parts is considered the weak point of the technology due to its high anisotropic structure and irregular behaviour. This research focuses on the application of the Arcan-based method to fused filament fabrication printed parts, to better understand their mechanical behaviour. In order to characterise and quantify the anisotropic behaviour, a butterfly type specimen was developed, taking into account the flaws presented by the process (e.g. need for support material for tilted surfaces, low resolution, etc.). Together with the Arcan type grip, a combination of vertical–transversal (VT), vertical-longitudinal (VL) and horizontal (H) printed samples were tested under three distinct loading conditions, 90° – tensile, 45° – combined loading and 0° – pure shear. For each set of samples, digital image correlation was used to analyse the deformation fields imposed by the distinct building orientations and loading conditions. Regarding the material, two different types of Nylon® (PA 12) were used, namely FX256 and CF15, being the second a short carbon fibre reinforced version of the first, allowing a comparison of the mechanical behaviour. The results show that the building orientation prevails, originating distinct fracture types and overall behaviour difference. It was shown that fibre presence does not create a stronger material, yet an increase in stiffness is observed for all building orientations, except VT, where both materials presented similar values, indicating that the fibre orientation is critical when taking into account the loading conditions. It was also observed that of all sample types, FX256 H specimens showed the closest to isotropic behaviour.

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“…Digital image correlation (DIC) technique is widely used in laminated as well as metallic structures for damage evaluation and detects surface strain in the composite patch repair (Caminero et al , 2012, 2013; Kashfuddoja and Ramji, 2015; Pavlopoulou et al , 2016). Experimental analysis requires the involvement of sophisticated instruments such as digital image correlation and digital photoelasticity techniques for measurement of the stress intensity around the crack tip and interfacial stresses in the adhesive layer.…”

Section: Introductionmentioning

confidence: 99%

Performance assessment and optimization of hybrid composite patch repair of aircraft structure

Makwana

Shaikh

2020

MMMS

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PurposeIn this article, a novel hybrid composite patch consisting of unidirectional carbon fiber and glass fiber is considered for repair of the aircraft structure. The purpose of this paper is to assess the performance of hybrid composite patch repair of cracked structure and propose an optimized solution to a designer for selection of the appropriate level of a parameter to ensure effective repair solution.Design/methodology/approachElastic properties of the hybrid composites are estimated by micromechanical modeling. Performance of hybrid composite patch repair is evaluated by numerical analysis of stress intensity factor (SIF), shear stress, and peel stress. Design of experiment is used to determine responses for a different combination of design parameters. The second-order mathematical model is suggested for SIF and peel stress. Adequacy of the model is checked by ANOVA and used as a fitness function. Multiobjective optimization is carried out with a genetic algorithm to arrive at the optimal solution.FindingsThe hybrid composite patch has maintained equilibrium between the SIF reduction and rise of the peel stress. The repair efficiency and repair durability can be ensured by selection of an optimum value of volume fraction of glass fiber, applied stress, and adhesive thickness.Originality/valueThe composite patch with varying stiffness is realized by hybridization with different volume fraction of fibers. Analysis and identification of optimum parameter to reduce the SIF and peel stress for hybrid composite patch repair are presented in this article.

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Using Digital Image Correlation Techniques for Damage Detection on Adhesively Bonded Composite Repairs

Cited by 19 publications

References 21 publications

Energy absorption of repaired composite laminates subjected to impact loading

Energy absorption of repaired composite laminates subjected to impact loading

Experimental characterisation of fused filament fabrication printed parts under tension, shear, and combined shear–tension loads via Arcan test

Performance assessment and optimization of hybrid composite patch repair of aircraft structure

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