Agglomeration and aspect ratio effects on the long-term creep of carbon nanotubes/fiber/polymer composite cylindrical shells

Hosseinpour, Komeil; Ghasemi, Ahmad Reza

doi:10.1177/1099636219857200

Cited by 10 publications

(11 citation statements)

References 30 publications

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“…This could be due to the fracture of agglomerates during the sample preparation process or to pre-existing internal flaws [ 46 ]. Defining the aspect ratio of the agglomerate as the ratio of their vertical length i.e., the length parallel to the loading direction, to the agglomerate’s horizontal length [ 47 ], it can be seen from Figure 8 that the apparent correlation between the shape, orientation, and alignment of the agglomerates was causing the crack initiation. We observed from the SEM micrographs that the silica agglomerates of aspect ratio greater than one (i.e., the longest length is oriented along the loading direction) were mostly fractured into halves.…”

Section: Resultsmentioning

confidence: 99%

Influence of Silica Specific Surface Area on the Viscoelastic and Fatigue Behaviors of Silica-Filled SBR Composites

et al. 2021

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This work aimed at studying the effect of a silica specific surface area (SSA), as determined by the nitrogen adsorption method, on the viscoelastic and fatigue behaviors of silica-filled styrene–butadiene rubber (SBR) composites. In particular, silica fillers with an SSA of 125 m2/g, 165 m2/g, and 200 m2/g were selected. Micro-computed X-ray tomography (µCT) was utilized to analyze the 3D morphology of the fillers within an SBR matrix prior to mechanical testing. It was found with this technique that the volume density of the agglomerates drastically decreased with decreasing silica SSA, indicating an increase in the silica dispersion state. The viscoelastic behavior was evaluated by dynamic mechanical analysis (DMA) and hysteresis loss experiments. The fatigue behavior was studied by cyclic tensile loading until rupture enabled the generation of Wöhler curves. Digital image correlation (DIC) was used to evaluate the volume strain upon deformation, whereas µCT was used to evaluate the volume fraction of the fatigue-induced cracks. Last, scanning electron microscopy (SEM) was used to characterize, in detail, crack mechanisms. The main results indicate that fatigue life increased with decreasing silica SSA, which was also accompanied by a decrease in hysteresis loss and storage modulus. SEM investigations showed that filler–matrix debonding and filler fracture were the mechanisms at the origin of crack initiation. Both the volume fraction of the cracks obtained by µCT and the volume strain acquired from the DIC increased with increasing SSA of silica. The results are discussed based on the prominent role of the filler network on the viscoelastic and fatigue damage behaviors of SBR composites.

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Section: Resultsmentioning

confidence: 99%

Influence of Silica Specific Surface Area on the Viscoelastic and Fatigue Behaviors of Silica-Filled SBR Composites

et al. 2021

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“…It is known that, as also discussed by Ghasami et al 33,34 uniform and homogeneous dispersion of CNTs in the matrix is extremely important for the improvement of all properties of composite materials. For this purpose, SEM analysis was conducted on the fracture surfaces of the flexural three-point bending specimens.…”

Section: Distribution Of Cnts In Epoxy Matrixmentioning

confidence: 87%

Contribution of carbon nanotubes to vibration damping behavior of epoxy and its carbon fiber composites

Avil

Kadıoğlu

Kaynak

2020

Journal of Reinforced Plastics and Composites

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The main objective of this study was to investigate contribution of the non-functionalized multi-walled carbon nanotubes on the vibration damping behavior of first neat epoxy resin and then unidirectional and bidirectional continuous carbon fiber reinforced epoxy matrix composites. Epoxy/carbon nanotubes nanocomposites were produced by ultrasonic solution mixing method, while the continuous carbon fiber reinforced composite laminates were obtained via resin-infusion technique. Vibration analysis data of the specimens were evaluated by half-power bandwidth method; and the mechanical properties of the specimens were determined with three-point bending flexural tests, including morphological analyses under scanning electron microscopy. It was generally concluded that when even only 0.1 wt% carbon nanotubes were incorporated into neat epoxy resin, they have contributed not only to the mechanical properties (flexural strength and modulus), but also to the vibration behavior (damping ratio) of the epoxy. When 0.1 or 0.5 wt% carbon nanotubes were incorporated into continuous carbon fiber reinforced epoxy matrix composites, although they have no additional contribution to the mechanical properties, their contribution in terms of damping ratio of the composites were significant.

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“…When η > μ, the heterogeneity of the CNTs distribution grows with the increase of η. 25,26 To analyze the agglomeration effects, primarily the effective elastic stiffness of the clusters and the matrix should be estimated. Among different micromechanical methods for estimating the elastic properties of the clusters and the matrix, the MT method is used in this research.…”

Section: Analytical Formulationmentioning

confidence: 99%

“…Employing the GDQM, they illustrated that agglomeration parameters μ and η have a significant effect on the natural frequencies, but can't alter the wave number. Hosseinpour and Ghasemi 25 investigated the effects of CNTs agglomeration on long-term creep strain and stress in composite cylindrical shells and showed that CNTs agglomeration increases the creep strain. The influences of CNTs agglomeration on the vibration of multi-phase cylindrical shells have been studied by Ghasemi et al 26 A method for investigating the effect of aggregation on CNTs composites developed using micromechanics model predicted the elastic properties of reinforced polymers with the agglomeration of fillers.…”

Section: Introductionmentioning

confidence: 99%

Agglomerated carbon nanotubes effects on buckling behavior of fiber metal laminated nanocomposite shells

Soleymani

Ghasemi

Moslemi-Abyaneh

2022

Polymers and Polymer Composites

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In this research, the influence of carbon nanotubes agglomeration on the buckling behavior of multi-phase CNTs/fiber/polymer/metal composite laminates cylindrical shells under hydrostatic pressure was investigated. Governing equations were derived according to the Kirchhoff-Love’s first approximation shell theory and solved by a combination of the Galerkin and Fourier series expansion methods. Equivalent elastic properties of multi-phase CNTs/fiber/polymer/metal laminated (CNTFPML) cylindrical shell were obtained using the Eshelby-Mori-Tanaka approach, considering the dispersion and agglomeration effects. Primarily, CNTs were added to the polymer matrix and afterwards, this new matrix was reinforced by carbon or glass fiber materials. Finally, the composite layer was joined with metal layers and a hybrid shell prepared. The accuracy of the applied method was validated with the finite element method and experimental tests on carbon/epoxy and glass/epoxy composite cylinders under hydrostatic pressure. The results indicate that the CNTs agglomeration, weight and volume fraction of CNTs and type of fiber materials, have a key role on the critical buckling capacity of multi-phase composite shells.

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Agglomeration and aspect ratio effects on the long-term creep of carbon nanotubes/fiber/polymer composite cylindrical shells

Cited by 10 publications

References 30 publications

Influence of Silica Specific Surface Area on the Viscoelastic and Fatigue Behaviors of Silica-Filled SBR Composites

Influence of Silica Specific Surface Area on the Viscoelastic and Fatigue Behaviors of Silica-Filled SBR Composites

Contribution of carbon nanotubes to vibration damping behavior of epoxy and its carbon fiber composites

Agglomerated carbon nanotubes effects on buckling behavior of fiber metal laminated nanocomposite shells

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