The influence of fiber alignment, structure and concentration on mechanical behavior of carbon nanofiber/epoxy composites: Experimental and numerical study

Chanda, Amit; Sinha, Sujeet K.; Datla, Naresh V.

doi:10.1002/pc.25890

Cited by 21 publications

(16 citation statements)

References 42 publications

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“…[13] The cross-linking needs to be carefully optimized because it can lead to void formation resulting in decreased fracture toughness due to lower resistance to crack growth and increased internal stresses. For nanoscale reinforcement, carbon nanofibers (CNFs), [14,15,16] graphitic CNFs, [17] carbon nanotubes (CNTs), [18] metal nanoparticles, [19] graphene, [20] nanoclays, [21] and nanosilica [22] have all been used for high-performance epoxy nanocomposites. The use of carbon and graphene-based reinforcements also potentially adds functional properties.…”

Section: Introductionmentioning

confidence: 99%

The role of interface on dynamic mechanical properties, dielectric performance, conductivity, and thermal stability of electrospun carbon nanofibers reinforced epoxy

et al. 2021

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Polymer nanocomposites containing pristine (PCNF) and aminefunctionalized (NFCNF) electrospun carbon nanofibers were fabricated. The amine-terminated functional groups on CNFs, with a surface coverage of 2.76 mmol/g, react with the epoxy monomers forming covalent linkages for better dispersion and stronger interface. The improved load transfer resulted in an improvement of 82% in storage modulus (rubbery region~70 C) and 20 C increase in the glass transition temperature for 1 wt% NFCNF-epoxy. Tensile strength and modulus improves by 22% and 27%, respectively, for 2 wt % NFCNF-epoxy. The thermal stability, dielectric properties and AC/DC conductivity are discussed in terms of the interfacial characteristics. These results highlight the potential of electrospun CNFs as structural and functional reinforcement.

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Section: Introductionmentioning

confidence: 99%

The role of interface on dynamic mechanical properties, dielectric performance, conductivity, and thermal stability of electrospun carbon nanofibers reinforced epoxy

et al. 2021

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“…The type of fracture and failure mechanisms in bulk nanocomposites and DCB specimens are not a part of this study and were already discussed in our previous works. [9,33] Figure 4 exhibits the electric field-assisted alignment of CNFs at different nanofiller concentrations. The direction of applied electric field is shown by the black arrow.…”

Section: Morphology and DC Conductivitymentioning

confidence: 99%

“…From this perspective, carbon nanomaterials were found to be an excellent reinforcement for epoxy, as they offer multiple advantages simultaneously. [8][9][10][11][12][13][14][15][16] For composite or nanocomposite structures, carbon nanomaterials improve multifunctional properties as well as the in-situ damage sensing capability of epoxy. Similarly, carbon nanomaterials increase strength and fracture toughness along with damage sensing capability of adhesive joints.…”

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confidence: 99%

Improved damage sensing with random/aligned carbon nanofiber in bulk epoxy and adhesive joints

2022

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In situ health monitoring of polymeric materials and adhesive joints can be done by adding conductive carbon nanofillers that enable inherent piezoresistive sensing capability in nonconductive polymers. In this study, carbon nanofiber (CNF) was added to epoxy in bulk and adhesive form to investigate their potential applications as strain and crack detection sensors, respectively. Tensile specimens of CNF/epoxy nanocomposites with different filler concentrations were tested to study their strain sensing capability. The nanocomposites were further used as adhesive for sensing crack propagation in adhesive joints. CNFs alignment was carried out inside the adhesive by AC electric field to study the alignment effect on crack detection capability and fracture toughness of joints. Tensile specimens showed excellent strain sensing capability at CNF concentrations of 0.4, 0.8, and 1.2 wt%. However, the gauge factor was found to be highest at 0.4 wt% and decreasing further with increasing CNF content. The CNF addition was found to enhance the crack detection capability as well as the fracture toughness in adhesive joints. Further improvements in the crack detection capability and fracture toughness were observed in the case of aligned nanocomposite joints. However, the effect of alignment was observed to be more profound at lower CNF content.

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“…[26] In addition to experiments, the finite element analysis (FEA) method is often introduced to predict the performance of the material, which is time-and resource-saving. [27,28] As a finite element pre-and post-processing tool, HyperMesh has powerful finite element meshing and data-exchange ability with many CAD systems. It is regularly used in the field of structural optimization, and could be combined with multiple solvers effectively, such as OptiStruct, ANSYS, ABAQUS, and so on.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the behavior of epoxy foam‐filled 3D woven spacer composites under bending load

et al. 2022

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In this work, three‐dimensional woven spacer glass fiber/epoxy composites (3DWSC) and epoxy foam‐filled three‐dimensional woven spacer composites (FF‐3DWSC) were prepared, and the behavior of the two composites under bending load was investigated experimentally and numerically. The results show that compared with 3DWSC, FF‐3DWSC displayed a higher bending strength of 134.30 MPa and superior bending stiffness of 9.48 × 106 N·mm2, which was attributed to the synergistic effect of the foam and the skeleton. And unlike the serious damage caused by the significant stress concentration in 3DWSC under bending load, less damage appeared in FF‐3DWSC because the stress was dispersed by the efficient transmission of the load between foam and column yarns. Besides, there was no delamination between the foam and the skeleton after the bending test, indicating the excellent integrated structure of FF‐3DWSC. In addition, the bending behavior of 3DWSC and FF‐3DWSC was simulated on the macro‐scale model by HyperMesh and HyperView. As a result, the finite element analysis results were in close agreement with the experimental results, demonstrating the finite element simulation method proposed here is capable of being used in replacing time‐consuming experiments to study the bending properties of such 3D composites.

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The influence of fiber alignment, structure and concentration on mechanical behavior of carbon nanofiber/epoxy composites: Experimental and numerical study

Cited by 21 publications

References 42 publications

The role of interface on dynamic mechanical properties, dielectric performance, conductivity, and thermal stability of electrospun carbon nanofibers reinforced epoxy

The role of interface on dynamic mechanical properties, dielectric performance, conductivity, and thermal stability of electrospun carbon nanofibers reinforced epoxy

Improved damage sensing with random/aligned carbon nanofiber in bulk epoxy and adhesive joints

Experimental and numerical study of the behavior of epoxy foam‐filled 3D woven spacer composites under bending load

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