Investigation of the crack front process zone in the Double Cantilever Beam test with backface strain monitoring technique

Salem, N. Ben; Budzik, Michal K.; Jumel, Julien; Shanahan, M. E. R.; Lavelle, Florian

doi:10.1016/j.engfracmech.2012.09.028

Cited by 34 publications

(23 citation statements)

References 29 publications

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“…Each test has several objectives: to overcome the shortcomings of others (parasite stress, edge effects), to introduce new load types (single mode or mixed modes), to test thin films or complete bonded structures, etc. [7][8][9], with the view of obtaining a criterion which allows the adhesion to be defined. This determination can be carried out in two ways: by initiating an adhesive failure or by propagating adhesive failure.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Using a protocol previously described [33], an instrumented DCB test was performed under constant specimen opening rate using a universal tensile testing machine (Zwick=Roell Z010, Zwick GmbH & Co., Ulm, Germany). The results of this test, with constant 0.3 mm=min crosshead speed, will be referred to as monotonic.…”

Section: Dcb Testmentioning

confidence: 99%

Comparison of Cyclic and Monotonic Loading of a Double Cantilever Beam Adhesion Test

Budzik

Jumel

Salem

et al. 2013

The Journal of Adhesion

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Double Cantilever Beam (DCB) specimens were made from aluminium plates bonded with Hysol 1 EA9321 epoxy adhesive. These were tested both under monotonic and cyclic loading conditions. Experimental testing data were obtained from classic force and displacement measurements, as well as from backface strain recordings. Apart from the usual crack propagation monitoring, evolution of the process zone at the crack tip was studied during the experiment. Results of fatigue were compared with those of standard loading. Despite the viscoelastic nature of the adhesive, an elastic treatment of the results proved most satisfactory. In addition, good agreement was found between experimental and theoretical results obtained with a Timoshenko beam on Winkler elastic foundation model.

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“…[14,15]) and changes the dynamic properties significantly, and therefore has a major influence on the lifetime of the structure. The delamination behavior of composite materials is characterized by different specimens for mode-I [16][17][18][19][20][21][22][23], mode-II [24][25][26], mixed-mode I/II [27][28][29][30][31][32][33][34][35][36][37], mode-III [38][39][40][41][42][43][44][45][46][47][48], mixed-mode I/III [49] mixed-mode II/III [42,[50][51][52][53][54][55][56][57][58][59] and mixed-mode I/II/III [60][61]…”

Section: Introductionmentioning

confidence: 99%

Antiplane–inplane shear mode delamination between two second-order shear deformable composite plates

Szekrényes

2016

Mathematics and Mechanics of Solids

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The second-order laminated plate theory is utilized in this work to analyze orthotropic composite plates with asymmetric delamination. First, a displacement field satisfying the system of exact kinematic conditions is presented by developing a double-plate system in the uncracked plate portion. The basic equations of linear elasticity and Hamilton's principle are utilized to derive the system of equilibrium and governing equations. As an example, a delaminated simply supported plate is analyzed using Lévy plate formulation and the state-space model by varying the position of the delamination along the plate thickness. The displacements, strains, stresses and the J-integral are calculated by the plate theory solution and compared with those by linear finite-element calculations. The comparison of the numerical and analytical results shows that the second-order plate theory captures very well the mechanical fields. However, if the delamination is separated by only a relatively thin layer from the plate boundary surface, then the second-order plate theory approximates badly the stress resultants and so the mode-II and mode-III J-integrals and thus leads to erroneous results.

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Investigation of the crack front process zone in the Double Cantilever Beam test with backface strain monitoring technique

Cited by 34 publications

References 29 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

Comparison of Cyclic and Monotonic Loading of a Double Cantilever Beam Adhesion Test

Antiplane–inplane shear mode delamination between two second-order shear deformable composite plates

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