The influence of GNP and nano-silica additives on fatigue life and crack initiation phase of Al-GFRP bonded lap joints subjected to four-point bending

Zamani, Pedram; Jaamialahmadi, Abdolrahman; Silva, Lucas F. M. da

doi:10.1016/j.compositesb.2020.108589

Cited by 67 publications

(48 citation statements)

References 50 publications

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“…The mechanical properties of the steel substrates and the epoxy adhesive are presented in Table 1. For properties improvement, it is common to incorporate particles with various shapes and properties such as CNT, 49,50 GNP, 31,45,48 and nano-silica 32,33,48 into polymeric adhesive systems. CNTs are known as additive materials with exceptional electronic, thermal, and mechanical properties.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, due to the adhesive high viscosity, the mixing parameters could not induce enough shear stress in the fluid (mixture of resin and nanoparticles) to break the aggregated particles. Thus, following previous research, 48,56 a second pre-study phase included mixing the resin with acetone, and subsequently, trying different mixing speeds for each of 0.2 and 0.5 wt% contents. For the lap shear coupons prepared in this phase, the static tests showed that, under mixing speeds such as 400 and 800 rpm, no significant improvement was found compared to neat joints, while the highest static strength was obtained at a stirring speed of 2250 rpm.…”

Section: Preparation Of Specimensmentioning

confidence: 99%

“…For low stress levels, the dispersion of SiC and nano-alumina particles led to maximum and minimum fatigue life enhancement, respectively. Zamani et al 48 added GNP and nano-silica particles separately (in 0.5, 1, and 1.5 wt%) and in mixture form (0.5 wt% of each particle) to an epoxy adhesive, and studied the fatigue behavior and crack initiation of aluminum to composite bonded joints. In single type reinforcement and under load ratios of R = 0.5 and R = 0, they found that, for 0.5 wt.% and 1 wt.% contents, adding GNPs to the adhesive improves the static strength, fatigue life, and crack initiation life.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigating on the influence of multi‐walled carbon nanotube and graphene nanoplatelet additives on residual strength of bonded joints subjected to partial fatigue loading

NajiMehr

Mahmood

Zamani

et al. 2021

J of Applied Polymer Sci

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Adhesively bonded joints in engineering structures, especially automotive body structures, inevitably experience long or limited fatigue loading conditions. In this article, the shear strength of steel bonded lap joints reinforced by multi-walled carbon nanotube (MWCNT) and graphene nanoplatelet (GNP) were evaluated after being subjected to limited fatigue loading cycles. For this purpose, three specimen groups of neat, MWCNT, and GNP-reinforced joints (with 0.2, 0.5, 1.0, and 2.0 wt% contents) were prepared. After performing the static lap shear tests, fatigue testing of each specimen group was conducted under a maximum fatigue load of 50% of its average static failure load until complete separation of the substrates. Accordingly, limited fatigue loadings were applied to each specimen group for 30%, 50%, and 70% of its total fatigue life, and subsequently, a secondround static testing was performed to evaluate the residual strength of the joints.The results revealed that the maximum static shear strength improvements of MWCNT and GNP-reinforced joints were associated with incorporating 1.0 and 0.5 wt% particle contents. Moreover, for 0.2 and 0.5 wt% contents, the static strength of the joints reinforced by GNPs was 3.4% and 3.9% greater than that of MWCNTs reinforced joints. On the contrary, for 1.0 and 2.0 wt% filler contents, specimens including MWCNTs had 9.1% and 18.6% higher strength than GNP-reinforced ones. The highest fatigue life enhancements of 34.1% and 31% were obtained by adding 1.0 and 0.5 wt.% of MWCNT and GNP particles to the adhesive, respectively. It was concluded that, for 0.2 and 0.5 wt% contents, nanoparticle type did not have a noticeable effect on the residual strength of the joints after being subjected to fatigue loading for 30% of its total life. The specimens subjected to 50% and 70% of their total fatigue life indicated a minimum loss in the shear strength for the joints reinforced by dispersing 1.0 wt% of MWCNTs.

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Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigating on the influence of multi‐walled carbon nanotube and graphene nanoplatelet additives on residual strength of bonded joints subjected to partial fatigue loading

NajiMehr

Mahmood

Zamani

et al. 2021

J of Applied Polymer Sci

Self Cite

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“…Khayamdar and Khoramishad 33 found that the hybrid incorporation of MWCNTs and aluminum fibers led to greatest enhancements in static strength of adhesive joints. In a study performed by Zamani et al, 34 the influence of separate and mixed addition of nano silica and GNP particles into an epoxy adhesive was investigated on the static strength, fatigue behavior, and fatigue crack initiation life (CIL). They found that adding a mixture of nano silica and GNP (including 0.5 wt.% of each particle) resulted in higher static strength and longer fatigue life than single‐type reinforced joints with 0.5 and 1.0 wt.% of each particle.…”

Section: Introductionmentioning

confidence: 99%

On the static and fatigue life of nano‐reinforced Al‐GFRP bonded joints under different dispersion treatments

Zamani

Alaei

Silva

et al. 2022

Fatigue Fract Eng Mat Struct

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As bonded components of engineering structures inevitably experience fatigue loading conditions during their service life, it is significant to find ways to enhance their endurance. Also, adding nanoparticles to the adhesive can be introduced as an approach to design more durable bonded joints. In this way, it is important to determine a nanoparticle dispersion method which can lead to the longest fatigue life. Accordingly, this paper aims to investigate the influence of various nanoparticle dispersion treatments on static and fatigue responses of aluminum‐to‐composite bonded joints under four‐point bending. For this purpose, four dispersion techniques of mechanical stirring, bath‐sonication, low‐power and high‐power probe‐sonication were used to disperse nanoparticles into the adhesive. Also, four specimen groups of neat (with no additive particles), graphene nano platelet (GNP)‐reinforced, nano silica‐reinforced, and hybrid‐reinforced (including GNP + nano silica) were prepared. Results indicated that, for the joints including GNPs, the longest fatigue life was achieved for the specimens prepared by low‐power sonication method, while for hybrid‐type reinforcements, using high‐power method led to the highest endurance. Moreover, for 0.5 and 1.0 wt.% of nano silica, the endurance of bath‐sonicated specimens was 12.77% and 9.28% longer than low and high‐power probe‐sonicated joints, respectively. Using the backface strain (BFS) measurement technique, the influence of dispersion methods was studied on extending the crack initiation life (CIL) of each joint group. It was revealed that, for 0.5 wt.% and 1.0 wt.% of nano silica, the CIL is independent of the dispersion method, while, for 1.5 wt.%, probe sonicated specimens had the longest CIL. The microstructural characterization of each dispersion method and major reinforcing mechanisms were interpreted by scanning electron microscopy (SEM). For future researches, using X‐ray tomography and health monitoring methods is recommended to detect size and location of damage for nanoparticle reinforced composite structures.

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“…As a direct consequence of this complexity, the failure mechanisms of different nano-reinforced ABJs, in particular, ABJs formed using different adhesives, various nanoparticles, and dissimilar adherents, should continue to be investigated. However, there are numerous studies [26][27][28] analyzing the mechanical behavior of different material bonds reinforced with different nanoparticles. Consequently, new studies are needed to better exploit the potential of hybrid connections made with dissimilar materials and to determine optimum connection configurations.…”

Section: Introductionmentioning

confidence: 99%

MWCNT, nano‐silica, and nano‐clay additives effects on adhesion performance of dissimilar materials bonded joints

Çakır

Kinay

2021

Polymer Composites

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Large vehicles, ships, and airplanes are made of hybrid structures with a combination of metal and composite materials. Aluminum and fiber composites are widely used in the aerospace, automotive, and marine industries due to their high strength/weight ratios. In these industries, adhesive joints are preferred as the primary method of forming structural joints. Although the use of adhesives in a combination with different materials provides many advantages over mechanical methods, efforts are being made to increase the strength of the adhesive connection. In this study, three different nanoparticles such as nanosilica, nanoclay, and multiwalled carbon nanotubes (MWCNTs) were added to a commercial epoxy adhesive (Araldite 2014), and the shear strengths of singlelap joints made of aluminum and glass fiber reinforced polymer composite were investigated. According to the experimental results, adding nanoparticles increased the strength of the bonded joints. The best increase was determined as 62% for the connection with 0.5 wt% MWCNTs added. On the other hand, the improvement in the bond with 1.5 wt% nanoclay was found to be 37.8%, while the improvement in the bond with 1.5% nanosilica was 43.3%. Failure types of samples after the mechanical tests were analyzed by taking macro and scanning electron microscopy images from the overlap sides.

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The influence of GNP and nano-silica additives on fatigue life and crack initiation phase of Al-GFRP bonded lap joints subjected to four-point bending

Cited by 67 publications

References 50 publications

Investigating on the influence of multi‐walled carbon nanotube and graphene nanoplatelet additives on residual strength of bonded joints subjected to partial fatigue loading

Investigating on the influence of multi‐walled carbon nanotube and graphene nanoplatelet additives on residual strength of bonded joints subjected to partial fatigue loading

On the static and fatigue life of nano‐reinforced Al‐GFRP bonded joints under different dispersion treatments

MWCNT, nano‐silica, and nano‐clay additives effects on adhesion performance of dissimilar materials bonded joints

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