Mixed-mode fracture characterization of adhesive joints

Fernlund, G.; Spelt, J.K.

doi:10.1016/0266-3538(94)90052-3

Cited by 167 publications

(79 citation statements)

References 15 publications

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“…In this case, various loading mode ratios could be established with a single DCB by suitably altering the pin locations as described in ref. [15].…”

Section: Test Specimensmentioning

confidence: 99%

“…As mentioned previously, a full range of mode ratios could be generated with a single DCB specimen by adjusting the positions of the link pins [15]. Crack lengths were measured to an accuracy of approximately 20 μm using an optical microscope having a field of view of 2 mm mounted on a micrometer stage.…”

Section: Fracture Testsmentioning

confidence: 99%

“…The applied strain energy release rates, G, and mode ratios, Ψ, of the adhesive joints were calculated using a beam-on-elastic-foundation model which takes into account the compliance of the adhesive layer [15] [24]. Table 2 summarizes the material properties used in the calculations.…”

Section: Strain Energy Release Rate and Mode Ratio Calculationsmentioning

confidence: 99%

See 2 more Smart Citations

Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

Jhin¹,

Azari²,

Ameli³

et al. 2013

International Journal of Adhesion and Adhesives

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The relationship between crack path and test method was examined by comparing the performance of adhesive-adherend combinations (six) in quasi-static fracture, mixed-mode fatigue, and creep crack growth. Crack paths in creep and quasi-static fracture were similar due to similar crack-tip plastic zone sizes in the epoxy adhesive even though the crack growth rates in creep were much smaller. Under condensed moisture and mixed-mode, creep and threshold fatigue tests produced interfacial failure. Under room-temperature dry environment, near threshold mixed-mode fatigue was interfacial, but was not in creep or quasi-static fracture.Smaller plastic zone size and crack path proximity to the interface that followed increased the sensitivity of near threshold, mixed-mode fatigue to surface properties. Therefore, the interfacial or cohesive failure of an adhesive system, which may judge the quality of the bond, can be a function of the test being conducted and may not be an absolute indicator of joint quality.iii Acknowledgements I would like to thank Professor Spelt and Professor Papini for their undivided attention to the progress of my research from my just starting learning about the theoretical and practical aspects of adhesive joints until the submission of my first journal paper. Without their direction and contribution, this thesis and its paper counter-part could not have reached the level of caliber and attention to detail that it has reached now. Although they probably deserve more than a brief mention, I would also like to thank all my previous and current lab mates who have been such a great help explaining to me all the theoretical and practical aspects of fracture mechanics, and how can I forget the innumerable hours spent on discussing research, science, politics and life in general. They are, without the order of importance: Siva Prasad Varma Nadimpalli, Naresh

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“…In this case, various loading mode ratios could be established with a single DCB by suitably altering the pin locations as described in ref. [15].…”

Section: Test Specimensmentioning

confidence: 99%

Section: Fracture Testsmentioning

confidence: 99%

See 1 more Smart Citation

Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

Jhin¹,

Azari²,

Ameli³

et al. 2013

International Journal of Adhesion and Adhesives

Self Cite

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“…In such joints, the use of structural adhesives rather than traditional systems (such as welding or riveting, for instance) provides the end product with a lighter weight, more uniform tension distribution and improved tightness; eliminates galvanic corrosion; and generates a myriad of other benefits. [5] Studies have been conducted that either evaluate the mechanical behaviour of the adhesive bonds that join aluminium with a composite [6][7][8] or provide an experimental procedure that measures the adhesive bond strength of a joint between a composite and steel. [9][10][11][12] Jumel et al [13] analysed the propagation of the crack and the process zone with end-notched flexure (ENF) specimens for adhesive bonding of aluminium/epoxy This test is presented for exploitation with a new experimental methodology using the backface strain monitoring technique.…”

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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“…To the best knowledge of the present author, little mode-III and mixed-mode III/II experiments on fracture behavior of adhesive bonded joints have been reported in the literature [19][20][21][22][23]. Therefore, the objective of this study was to investigate mode-III and mixed-mode III/II fracture properties of adhesively bonded steel/epoxy joints.…”

mentioning

confidence: 99%

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

Mehrabadi

2014

appl adhes sci

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Evaluation of fracture energy of adhesive joints under mode-III and mixed-mode III/II is a key issue when failure analyses have to be performed. It is thus useful to determine fracture toughness under mode-III and characterization of crack front behavior of bonded joints under mixed-mode III/II loading conditions, which were the overall goal of this paper. For this purpose, edge crack torsion (ECT) and six-point bending plate (6PBP) tests were employed using steel/epoxy adhesive joint. The experimental tests were performed under displacement control and three types of configurations were tested to achieve different mixed-mode ratios. Test results showed considerable linearity before the maximum load point both under pure mode III and mixed-mode III/II; also, failure examination indicated that dominate failure under tearing mode was adhesive/adherend interface, which will be discussed in detail. The experimental tests were numerically simulated and virtual crack closure technique (VCCT) was employed to reproduce behavior of crack front propagation. Both experimental compliance method and finite element analysis proved applicable for the fracture mechanism of adhesive assemblies under mode-III and mixed-mode III/II.

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Mixed-mode fracture characterization of adhesive joints

Cited by 167 publications

References 15 publications

Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

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

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

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