Experimental analysis of the mechanical behaviour of a thick flexible adhesive under tensile/compression-shear loads

Créac’Hcadec, Romain; Jamin, Gabriel; Cognard, Jean‐Yves; Jousset, Pierre

doi:10.1016/j.ijadhadh.2013.09.040

Cited by 22 publications

(7 citation statements)

References 20 publications

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“…The ARCAN test was initially designed for composites, in view of obtaining uniform flat stresses, free of three-dimensional parasite stress [14]. The test was then adapted to structural bonded assemblies in order to study their behaviour when exposed to uniaxial and multiaxial stresses [15,16]. But, as with the previous tests, it does not allow the location of the failure initiation.…”

Section: Markmentioning

confidence: 99%

Using the 3-point bending method to study failure initiation in epoxide-aluminum joints

Sauvage

Aufray

Jeandrau

et al. 2017

International Journal of Adhesion and Adhesives

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 17849 A B S T R A C TThe increasing use of adhesives in industry has boosted the search for tests which allow the adherence level to be defined. These tests, depending on the type of load, examine different stresses, failure modes and mixed modes. Furthermore, these tests can be focused either on initiation or propagation of adhesive failure. The subject of this study is the initiation of adhesive failure. The initiation of failure can be determined with the 3-point bending test. Trials of 3-point bending tests were conducted on an aluminum 2024 substrate, with two different thicknesses, in order to understand the impact of the adherend thickness. The aluminum substrate received different types of surface pre-treatment: acetone cleaning, hydrochloric acid etching or aminopropyltriethoxysilane coating. Two adhesives were used: the first one was a mixture of epoxy pre-polymer DGEBA and DETA amine, whereas the second was a commercially formulated adhesive, ELECOLIT 6604. The initiation of adhesive failure was obtained by 3-point bending test and verified with SEM analysis. The failure loads measured enabled the effect of surface treatment on adhesive failure to be revealed: the results indicate that the surface treatment with silane is the most efficient in comparison to hydrochloric acid etching and of course to the simple acetone degreasing. It was assumed that the scatter of the results obtained for each series is due to the variation of the "intrinsic" adherence between the adhesive and the substrate. Furthermore, it was noted that the failure loads for different substrate thicknesses cannot be compared due to the effect of the thickness: it was therefore not possible to simply compare results obtained for different thicknesses of the same substrate for a given substrateadhesive system. The energy approach proposed in this study makes it possible. The energy requested to initiate the adhesive failure for a given system can then be known, whatever the initial geometry of the 3-point bending test is. However, it was also shown that the thickness of the substrate must be correctly chosen. A thick substrate increases the dispersion and a thin substrate may induce local unwelcome plastic strain. In conclusion, this study allows to define an energy criteria for adhesives failure initiation.

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Section: Markmentioning

confidence: 99%

Using the 3-point bending method to study failure initiation in epoxide-aluminum joints

Sauvage

Aufray

Jeandrau

et al. 2017

International Journal of Adhesion and Adhesives

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“…Adhesively bonded joints are suggested for lightweight structures used in the automotive and aeronautical sector where traditional fasteners are discouraged as a consequence of the necessity to join new and dissimilar materials. 1 In recent years, the use of metal-to-composite adhesive joints has expanded in maritime industries as well. As the application of adhesive joints possesses many desirable mechanical properties such as high strength to weight ratio, 2 good fatigue resistance properties, 3 high toughness and low-stress concentration 4 etcetera, they received significant attention of shipbuilding industries in the last few decades.…”

Section: Introductionmentioning

confidence: 99%

“…5 However, the integrity and damage mechanisms of adhesive joints are significant issues in naval industries, 4 and depend on specific parameters like service conditions, production of joint, 6,7 thickness of adherend and adhesive 8,9 and environmental conditions. 2 Numerous scientific studies have been conducted with focus on the durability of adhesive joints in the presence of water, salinity, temperature, fire and ultraviolet radiation 10 and their damage 1 Soete Laboratory, Department of Electromechanical Systems and Metal Engineering (EMSME), Ghent University, Ghent, Belgium 2 Structural Integrity & Composites Group, Faculty of Aerospace Engineering, Delft University of Technology, Delft, The Netherlands 3 Com&Sens, Gent, Belgium mechanisms. 2,[11][12][13] The results demonstrate that the most severe damage occurs at the adhesive/adherend interface.…”

Section: Introductionmentioning

confidence: 99%

Deformation and damage evolution of a full-scale adhesive joint between a steel bracket and a sandwich panel for naval application

Jaiswal

Kumar

Saeedifar

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The increasing interest for the application of adhesive joints in naval superstructures motivates researchers to gain an in-depth understanding of the mechanical behaviour and failure mechanisms of these joints. This work reports on an experimental study of the deformation behaviour and damage evolution of a full-scale multi-material joint using different instrumentation techniques. Adhesively bonded joints of steel to sandwich panel components have been subjected to quasi-static tensile tests during which the global deformation of the joint and local strain distributions were monitored using digital image correlation (DIC). During one particular tensile test, fibre optic Bragg sensors (FBG) were also applied to the specimen’s surface at different locations in order to quantify the evolution of local strains. Additionally, acoustic emission (AE) sensors were installed in order to monitor damage initiation and evolution with increasing levels of imposed deformation. This test showcased adhesive failure at the interface of the steel adherend and the adhesive, while cohesive failure was observed within the adhesive and skin failure at the interface between adhesive and the composite skin of the sandwich panel. The post-mortem observed failures modes were compared to the acoustic events that originated during the test due to damage initiation and propagation within the joint. The evolution of the different sensor signals, i.e. the damage expressed as cumulative AE energy and local strains measured with Bragg sensors and DIC, are mutually compared and acceptable correlation is found.

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“…Nano-particles have large surface activity, which is easy to produce physical or chemical combination with the polymer (Al-Turaif 2010 ), which can resist micro-crack initiation. Compared with EP composite material toughened by rubber, the strength and rigidity are decreased (Créac’hcadec et al 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and research of epoxy resin toughening agent

et al. 2016

SpringerPlus

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In this paper, a synthesis method of epoxy resin toughening agent was presented, then the chemical composition and molecular number were studied, which include the DSC curves analysis, the fracture surface morphology and bonding strength. In addition, the mechanism of epoxy resin toughening agent and the effect of toughening agent’s content to bonding strength were studied. The testing results reveal that this toughening agent can form a micro two-phase structure in epoxy-amine system, which results in the stable chemical properties and excellent physical properties.

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Experimental analysis of the mechanical behaviour of a thick flexible adhesive under tensile/compression-shear loads

Cited by 22 publications

References 20 publications

Using the 3-point bending method to study failure initiation in epoxide-aluminum joints

Using the 3-point bending method to study failure initiation in epoxide-aluminum joints

Deformation and damage evolution of a full-scale adhesive joint between a steel bracket and a sandwich panel for naval application

Synthesis and research of epoxy resin toughening agent

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