Analysis of adhesively bonded CFRE composite scarf joints modified with MWCNTs

Khashaba, U.A.; Aljinaidi, A.A.; Hamed, Mostafa A.

doi:10.1016/j.compositesa.2015.01.004

Cited by 42 publications

(41 citation statements)

References 36 publications

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“…Khashaba et al [7] found that the nanocomposite with 0.5wt% of MWCNTs has the maximum tensile properties compared with that have weight percentages of 0.25wt%, 0.75wt% and 1.00wt% MWCNTs. The good dispersion of 0.5wt% MWCNTs in epoxy adhesive was result in high improvements in the mechanical properties of scarf adhesive joint in carbon fiber composites, as reported by Khashaba et al [8,11] .…”

Section: Introductionmentioning

confidence: 65%

“…Agglomerations of MWCNTs reduce the interfacial area in the nanocomposites, and hence reduce the opportunity to take the advantage of the unique properties of the MWCNTs [19] . Based on the extensive literature survey, a 0.5wt% MWCNTs was selected, which showed improvements in the mechanical properties for different epoxy systems by many researchers [2][3][4][5][6][7][8][9][10][11] . The mass of the MWCNTs was estimated based on the total mass of PY 1092-1/HY 1092 epoxy system using digital balance with sensitivity of 0.0001 g.…”

Section: Determination the Mass Of Mwcnts And Epoxymentioning

confidence: 99%

“…Moderate loading percentage of MWCNTs can result in good dispersion as well as lower agglomeration. Accordingly, based on the extensive literature survey, a 0.5 wt% MWCNTs was selected that showed improvements in the mechanical properties for different epoxy systems by many researchers [2][3][4][5][6][7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Badawy

Khashaba

2018

Eng. Sci. and Milit. Techno.

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In the present work, tensile, shear and impact properties of epoxy modified with multi-walled carbon nanotubes (MWCNTs) are measured experimentally in accordance with ASTM standards. The MWCNTs were dispersed into the epoxy resin using ultrasonic processor. To avoid damaging the nanotubes, the sonication process was performed at low-amplitude (225W) in a short duration of 30 min. The mixture was evacuated to remove air bubbles before further mixing with hardener. Results from the experimental study showed that incorporation of the MWCNTs into the epoxy resin improves the tensile strength and modulus of the MWCNT-nanocomposite by 11% and 68.7%, respectively, compared with those of the neat epoxy. The shear strength and inplane shear modulus of the MWCNT-nanocomposite were improved by 22.2% and 29%, respectively. The drop weight impact performance of the MWCNT-nanocomposite showed an improvement in the maximum contact force and the absorbed energy of the MWCNT-nanocomposite by 9.5% and 11.4%, respectively.

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Section: Introductionmentioning

confidence: 65%

Section: Determination the Mass Of Mwcnts And Epoxymentioning

confidence: 99%

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Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Badawy

Khashaba

2018

Eng. Sci. and Milit. Techno.

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“…The present work is a continuation of previous study [1,2]. Khashaba et al [2] modified Epocast 50-A1/946 epoxy through infusion of multiwalled carbon nanotubes (MWCNTs) with different weight percentage.…”

Section: Introductionmentioning

confidence: 86%

“…Khashaba et al [1,3] attributed this result to the higher s sn /r n ratio (5 11.4), which was calculated at 58 scarf angle (h) from the following equation:…”

Section: Introductionmentioning

confidence: 99%

Improvement of toughness and shear properties of multiwalled carbon nanotubes/epoxy composites

Khashaba

2016

Polymer Composites

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In this work, Epocast 50-A1/946 epoxy have been modified with different weight percentages (0.25, 0.5, 0.75, 0.1, 1.25, and 1.5 wt%) of multiwalled carbon nanotubes (MWCNTs). Because of Epocast epoxy was primarily developed for joining and repairing of composite aircraft structural components, the optimum weight percentage of MWCNTs must be determined based on trade-offs between the optimum tensile, inplane shear and toughness properties of the developed MWCNTs-composites, which is the objective of this study. The effect of MWCNTs on the toughness and inplane shear was studied using single-edge notch tension and Iosipescu shear tests, respectively. The experimental results showed that the composite materials with 0.75 wt% MWCNTs has the highest improvement in the in-plane shear properties compared to the neat epoxy. While the maximum improvements in the tensile and toughness properties were observed at 0.5 wt% MWCNTs. Eleven models were selected from an extensive literature survey, for predicting the in-plane shear moduli of the developed MWCNTs-composites. The modified rule of mixture can effectively predict the in-plane shear moduli of the composites with MWCNTs up to 0.75 wt%. While the nonlinear behavior of the modified Halpin-Tsai model with exponential shape function is the closest to the experimental results up to 1.5 wt% MWCNTs. POLYM. COMPOS., 00:000-000, 2016.

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Hygrothermal effects on mechanical behavior of scarf repaired carbon‐epoxy laminates subject to axial compression loads: Experiment and numerical simulation

Cheng

Zhang

et al. 2016

Polymer Composites

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Experimental and numerical study are carried out to investigate hygrothermal effects on the mechanical behavior and damage propagation of scarf repaired carbon fiber reinforced plastic (CFRP) laminates. Experimental tests were carried out under four environment conditions: room temperature/dry, room temperature/ wet, elevated temperature (958C)/dry and elevated temperature (958C)/wet. Results showed no decrease in compression strength after moisture absorption, whereas the reduction under elevated temperature were 15.5% and 17.2% for dry and wet specimens, respectively. Furthermore, a finite element model was developed to simulate the failure process and predict structural strength, in which moisture diffusion, hygrothermal stress analysis and progressive damage model were considered. Good agreement was achieved between the predicted compression strength and experimental results. It is revealed that the damage in the adhesive initiates adjacent to 08 plies and propagates in circumferential direction. Water absorption causes initial damage in the edge of the adhesive layer, while it does not reduce the compression strength. And elevated temperature leads to earlier damage in adhesive. After large part of the adhesive layer damaged, damages in parent laminate occur and propagate transversely to the free edge sides until the final structural collapse, which is similar with the experimental phenomenon. POLYM. COM-POS., 39:904-914,

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Analysis of adhesively bonded CFRE composite scarf joints modified with MWCNTs

Cited by 42 publications

References 36 publications

Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Improvement of toughness and shear properties of multiwalled carbon nanotubes/epoxy composites

Hygrothermal effects on mechanical behavior of scarf repaired carbon‐epoxy laminates subject to axial compression loads: Experiment and numerical simulation

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