Development of a laser shock adhesion test for the assessment of weak adhesive bonded CFRP structures

Ehrhart, Bastien; Ecault, Romain; Touchard, Fabienne; Boustie, M.; Berthe, Laurent; Bockenheimer, Clemens; Valeske, Bernd

doi:10.1016/j.ijadhadh.2014.04.002

Cited by 65 publications

(38 citation statements)

References 14 publications

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“…This technique can create a short but intense inside loading into the shocked sample. Recently, it has been applied on aeronautical composite materials and composite assemblies [8,9]. In this study, laser shocks are performed to eco-composite materials.…”

Section: Laser Shock Techniquementioning

confidence: 99%

Comparison of damage behaviour of different plant fibre composites under laser impact loading

Touchard

Berthe²,

Malinowski³

et al. 2015

Matériaux & Techniques

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract -The high strain rate behaviour of the eco-composites, when submitted to laser impact loading, is not well known yet. Crucial questions are still open: influence of plant fiber length and distribution on the composite impact behaviour, types of damage induced by impact loading, the way the failure occurs, etc. We present the very first results of a collaborative research involving the institutions PPRIME-Poitiers and PIMM-Paris, and IMP PAN-Gdansk-Poland. A comparison of laser shock induced damage is realised, based on observations of sample back faces for several types of eco-composites. Spallation, residual blister and inside delamination, depending on the fibre length in tested composites have been observed. The ability of the Terahertz technique for internal damage detection is demonstrated.

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Section: Laser Shock Techniquementioning

confidence: 99%

Comparison of damage behaviour of different plant fibre composites under laser impact loading

Touchard

Berthe²,

Malinowski³

et al. 2015

Matériaux & Techniques

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“…In the literature, various detection methods for different types of contamination are described [e.g., [5][6][7]. However, the limiting factor for these attempts is the unpredictable number of contamination sources and possible unknown substances and their low concentration level.…”

Section: Surface Contaminationmentioning

confidence: 99%

On the Fabrication and Automation of Reliable Bonded Composite Repairs

Holtmannspötter¹,

Czarnecki²,

Feucht³

et al. 2014

The Journal of Adhesion

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“…[20] Other authors have explored the potential of laser shock waves originally developed for coating to detect weak adhesive bonds of carbon fiber-reinforced polymers. [21,22] Furthermore, many researchers have employed electromechanical impedance (EMI) technique; Malinowski1 et al used the frequency shift of the first resonant mode and the root mean square as indicators to differentiate strong bonds from weak bonds. [23] The authors detected a frequency change with weak bond level (contamination and level of poor curing).…”

Section: Introductionmentioning

confidence: 99%

The use of acoustic emission and composite peel tests to detect weak adhesion in composite structures

Freitas

Zarouchas

Poulis

2018

The Journal of Adhesion

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Adhesive bonding is one of the most promising joining technologies for composite aircraft. However, to comply with current aircraft certification rules, current safety-critical bonded joints, in which at least one of the interfaces requires additional surface preparation, are always used in combination with redundant mechanical fasteners, such as rivets and bolts. This lack of trust in bonded structures is mostly linked to the fear of lack of adhesion or a "weak bond".The aim of this paper is to tackle this challenge by assessing the ability to use composite peel tests and acoustic emission (AE) technique to assess adhesion quality and distinguish a good bond quality from a "weak bond".Composite Bell Peel (CBP) tests and Double-CantileverBeam (DCB) tests were performed on contaminated and noncontaminated CFRP bonded specimens. The results show that peel strength drops significantly at the location of the contaminated interface that has led to weak adhesion, as a result from adhesive failure. The AE signals obtained during DCB tests show different features for cracks growing at the interface ("weak bonds") and inside the adhesive layer (cohesive failure). In addition to this, scattering of the AE signals were observed in the contaminated specimens with "weak bonds". ARTICLE HISTORY

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Development of a laser shock adhesion test for the assessment of weak adhesive bonded CFRP structures

Abstract: is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible.This is an author-deposited version published in: http://sam.ensam.eu Handle

Cited by 65 publications

References 14 publications

Comparison of damage behaviour of different plant fibre composites under laser impact loading

Comparison of damage behaviour of different plant fibre composites under laser impact loading

On the Fabrication and Automation of Reliable Bonded Composite Repairs

The use of acoustic emission and composite peel tests to detect weak adhesion in composite structures

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