Experimental and numerical study of optimum functionally graded Aluminum/GFRP adhesive lap shear joints using Epoxy/CTBN

Dadian, Alireza; Rahnama, Saeed

doi:10.1016/j.ijadhadh.2021.102854

Cited by 11 publications

(5 citation statements)

References 23 publications

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“…In adhesive joints, failure is usually the result of a non-uniform distribution of stresses in the bond-line [ 105 ]. A non-uniform stress distribution is even more obvious in joints with dissimilar adherends and those operating in an extreme temperature range [ 106 ].…”

Section: Adhesive Layer Modificationsmentioning

confidence: 99%

“…These are considered as highly effective, but hard to implement alternatives to reduce the peel stress concentrations located at bond-line ends [ 112 , 113 ]. Dadian and Rahnama [ 105 ] performed an experimental and numerical study on functionally graded joints with dissimilar adherends, where 7075-T6 aluminium and a CFRP adherends were used. This research used a neat adhesive and four other epoxies containing different amounts of additives, namely 5,10, 15 and 20 phr (parts per hundred rubber), which led to adhesive formulations with increasingly higher ductility.…”

Section: Adhesive Layer Modificationsmentioning

confidence: 99%

“…As a result, the stress concentrations at both edges decreased and the inner zones of the adhesive layer were now able to provide a larger contribution to the overall load-bearing capacity of the joint. As seen in Figure 13 , shear strength was increased significantly in a mixed adhesive configuration, especially when compared to the related brittle and ductile adhesive [ 105 ]. It should be mentioned the failure load increases as the number of bands in the overlap increases.…”

Section: Adhesive Layer Modificationsmentioning

confidence: 99%

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Developments in Laminate Modification of Adhesively Bonded Composite Joints

et al. 2023

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The use of carbon fibre reinforced polymer (CFRP) materials is increasing in many different industries, such as those operating in the aviation, marine, and automotive sectors. In these applications, composite parts are often joined with other composite or metallic parts, where adhesive bonding plays a key role. Unlike conventional joining methods, adhesive bonding does not add weight or require the drilling of holes, both of which are major sources of stress concentration. The performance of a composite joint is dependent on multiple factors and can be improved by modifying the adhesive layer or the composite layup of the adherend. Moreover, joint geometry, surface preparation, and the manufacturing methods used for production are also important factors. The present work reviews recent developments on the design and manufacture of adhesively bonded joints with composite substrates, with particular interest in adherend modification techniques. The effects of stacking sequence, use of thin-plies, composite metal laminates and its specific surface preparations, and the use of toughened surface layers in the composite adherends are described for adhesively bonded CFRP structures.

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Section: Adhesive Layer Modificationsmentioning

confidence: 99%

Section: Adhesive Layer Modificationsmentioning

confidence: 99%

Section: Adhesive Layer Modificationsmentioning

confidence: 99%

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Developments in Laminate Modification of Adhesively Bonded Composite Joints

et al. 2023

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“…Recently, manufacturing challenges in realizing spatially tailored adhesives were discussed by (Marques et al, 2021). Dadian et al, (Dadian and Rahnama, 2021) has reported a remarkable improvement (≈ 300%) in shear load-carrying capacity of joint due to an optimal tailoring of adhesive. Functionally graded adhesives have already been employed in bonded repairs (Bouchikhi et al, 2010;Kim et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Pullout characteristics of functionally graded and degraded adhesive anchors

Kumar

Khan

Wardle

et al. 2023

European Journal of Mechanics - A/Solids

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“…To improve the bonding strength and reliability, numerous studies have been carried out, including different pretreatment methods of the bonding surface of the substrate; toughening of adhesive by adding inorganic particles, carbon nanotubes, , and short fibers; − the use of functionally graded and mixed adhesive; , and so on. Many different surface treatment methods have been used to improve bonding strength by enhancing the roughing of surface roughness or changing the surface free energy of the substrate, such as sandblasting technology, chemical etching, plasma etching, − laser activation, , and so on.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nonwoven Carbon Tissue-Reinforced Epoxy Resin Adhesive Layer on the Single Lap Bonding Strength of Aluminum Alloy Joints

Kong

Tao

et al. 2021

ACS Omega

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The present paper provides a solution to enhance the reliability of bonding. The effect of the nonwoven carbon tissue (NWCT) composite adhesive layer on the bonding strength and reliability of aluminum alloy of single lap joints (SLJ) was investigated by embedding NWCT into the epoxy adhesive layer. The bonding strength, Weibull distribution, metallography of cross section, and fracture surface morphology of NWCT specimens were investigated. The results showed that the average bonding strength and Weibull characteristic strength (WCS) of NWCT-reinforced specimen were 16.78 and 17.17 MPa, which increased by 70.2 and 66.7%, respectively, compared with the neat specimen, and the Weibull modulus increased from 11.46 to 22.83, which indicated that NWCT specimens had higher bonding reliability. The mechanism of microcrack formation was obtained by analyzing the cross section of specimen loaded 95% WCS without macroscopic damage. The metallographic section showed that the microcrack of the neat specimen originated from the adhesive–aluminum interface, while the microcracks of the NWCT specimen originated from the interface between short carbon fibers (SCF) and adhesive. Typical failure modes were gained from visual observation and SEM. The failure mode of the neat specimen included more Al–adhesive interface failure, while the NWCT specimen included more internal failure of adhesive–SCFs with the fracture, pullout, peeling, and slippage of SCFs improving the toughness and bonding strength of the adhesive layer. The bridging effect of SCFs in the adhesive layer reinforced by NWCT can even the load and release the stress to improve the bonding reliability.

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Experimental and numerical study of optimum functionally graded Aluminum/GFRP adhesive lap shear joints using Epoxy/CTBN

Cited by 11 publications

References 23 publications

Developments in Laminate Modification of Adhesively Bonded Composite Joints

Developments in Laminate Modification of Adhesively Bonded Composite Joints

Pullout characteristics of functionally graded and degraded adhesive anchors

Effect of Nonwoven Carbon Tissue-Reinforced Epoxy Resin Adhesive Layer on the Single Lap Bonding Strength of Aluminum Alloy Joints

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