Instrumented end notched flexure – Crack propagation and process zone monitoring Part II: Data reduction and experimental

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

doi:10.1016/j.ijsolstr.2012.08.030

Cited by 35 publications

(14 citation statements)

References 33 publications

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“…It can be clearly seen that the fracture process was cohesive, within the bondline. This is important for the symmetry of load transfer, as first noted in [28,33]. In Fig.…”

Section: Crack Locus and Symmetry Of Load Transfermentioning

confidence: 77%

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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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“…It can be clearly seen that the fracture process was cohesive, within the bondline. This is important for the symmetry of load transfer, as first noted in [28,33]. In Fig.…”

Section: Crack Locus and Symmetry Of Load Transfermentioning

confidence: 77%

“…These methods are, however, not direct per se and require appropriate analytical analysis. Further crack opening displacement measurement promises to be complicated for rigid and=or very thin adhesive [27,28].…”

Section: Introductionmentioning

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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“…In previous publications (Ben Budzik et al, 2013a), we proposed to monitor the crack propagation during the DCB and ENF tests with the BSM technique. Resistive strain gages are bonded to the outer sides of the upper and bottom adherends in order to measure the local longitudinal strain along the mid-line of the specimen.…”

Section: Direct Evaluation Of the Peel And Shear Stress/strain Quantimentioning

confidence: 99%

“…The adherend strain has been measured with traditional resistive strain gauges sensors (Ferracuti et al, 2007;Carrara et al, 2011) or more recently with Fibre Bragg Grating sensors (Sanderson et al, 2012;Sans et al, 2012). The so called Backface Strain Monitoring (BSM) technique have been applied on specimen designed for strength measurement such as lap shear specimens (Goglio and Rossetto, 2011;Khoramishad et al, 2010) or scarf joints (Gacoin et al, 2009), or on specimens designed for toughness measurement such as DCB specimens (Sanderson et al, 2012; or End Notched Flexure (ENF) ones Budzik et al, 2013a. BSM has enable to evidence cohesive stress distribution along the bondline in case of fatigue loading (Khoramishad et al, 2010;Budzik et al, 2013b) or stationary loading (Budzik et al, 2011) which could not be achieve with the J(h) technique.…”

Section: Introductionmentioning

confidence: 99%

Measurement of interface cohesive stresses and strains evolutions with combined mixed mode crack propagation test and Backface Strain Monitoring measurements

Jumel

Salem

Budzik

et al. 2015

International Journal of Solids and Structures

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a b s t r a c tA Mixed Mode Bending (MMB) test is used to study the fracture process of an adhesively bonded specimen. Simple Beam analysis is proposed to estimate the Strain Energy Released Rate (SERR) from the evolution of specimen compliance. The effect of interface compliance on the process zone extension and specimen deformation is studied. Additionally, the Backface Strain Monitoring (BSM) technique is used to probe the peel and shear cohesive stresses along the bondline. With a simple analysis, a systematic procedure is proposed to evaluate the cohesive stresses as well as the peel and shear strain evolutions in the vicinity of the crack tip position during crack propagation experiment under mixed mode conditions.

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“…Budzik et al [14] studied data reduction. Also, they made an experimental study of crack propagation and process zone with ENF specimens for adhesive bonding of aluminium/epoxy.…”

Section: Introductionmentioning

confidence: 99%

Mode II fracture energy in the adhesive bonding of dissimilar substrates: carbon fibre composite to aluminium joints

Alía

Reina

Suárez

et al. 2013

Journal of Adhesion Science and Technology

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The end-notched flexure (ENF) test calculates the value of mode II fracture energy in adhesive bonding between the substrates of same nature. Traditional methods of calculating fracture energy in the ENF test are not suitable in cases where the thickness of the adhesive is non-negligible compared with adherent thicknesses. To address this issue, a specific methodology for calculating mode II fracture energy has been proposed in this paper To illusfrate the applicability of the proposed method, the fracture energy was calculated by the ENF test for adhesive bonds between aluminium and a composite material, which considered two different types of adhesive (epoxy and polyurethane) and various surface freatments. The proposed calculation model provides higher values of fracture energy than those obtained from the simplified models that consider the adhesive thickness to be zero, supporting the conclusion that the calculation of mode II fracture energy for adhesives with non-negligible thickness relative to their adherents should be based on mathematical models, such as the method proposed in this paper, that incorporate the influence of this thick-

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Instrumented end notched flexure – Crack propagation and process zone monitoring Part II: Data reduction and experimental

Cited by 35 publications

References 33 publications

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

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

Measurement of interface cohesive stresses and strains evolutions with combined mixed mode crack propagation test and Backface Strain Monitoring measurements

Mode II fracture energy in the adhesive bonding of dissimilar substrates: carbon fibre composite to aluminium joints

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