Three-dimensional analysis of the interaction between a matrix crack and nanofiber

Gawandi, Anis; Whitney, James M.; Tandon, G. P.; Brockman, R.B.

doi:10.1016/j.compositesb.2009.04.001

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…It is known that large surface area of the fillers and associated interfacial bonding play a significant role in enhancing mechanical properties of the multiphase, composite materials (37). The effectiveness of the nanofiber reinforcement is anticipated to correlate strongly with the quality of the interfacial bonding between the nanofibers and epoxy matrix.…”

Section: Resultsmentioning

confidence: 99%

Engineering Chemistry of Electrospun Nanofibers and Interfaces in Nanocomposites for Superior Mechanical Properties

Özden

Menceloǵlu

Papila

2010

ACS Appl. Mater. Interfaces

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The novelty of this work is based on designing the chemistry of the electrospun nanofibers, so that the resultant composites substantially benefit from cross-linking between the nanofibers and the polymer matrix. Specifically, the solution of in-house synthesized copolymers polystyrene-co-glycidyl methacrylate P(St-co-GMA) is electrospun to produce mats of surface reactive nanoto-submicron scale fibers that are accompanied later by spraying over the ethylenediamine (EDA) as a supplementary cross-linking agent for epoxy. The P(St-co-GMA)/EDA fiber mats are then embedded into an epoxy resin. Analysis of the three-point-bending mode of the composites reveals that the storage modulus of P(St-co-GMA)/EDA nanofiber-reinforced epoxy are about 10 and 2.5 times higher than that of neat and P(St-co-GMA) nanofiber-reinforced epoxy, respectively, even though the weight fraction of the nanofibers was as low as 2 wt %. The significant increase in the mechanical response is attributed to the inherently cross-linked fiber structure and the surface modification/chemistry of the electrospun fibers, that results in cross-linked polymer matrix-nanofiber interfacial bonding.

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Section: Resultsmentioning

confidence: 99%

Engineering Chemistry of Electrospun Nanofibers and Interfaces in Nanocomposites for Superior Mechanical Properties

Özden

Menceloǵlu

Papila

2010

ACS Appl. Mater. Interfaces

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“…Titanium dioxide nanofibres (TNF) are one-dimensional nanomaterials with length in microscale and diameter in nanoscale [35]. They have very high specific surface area and along with its larger length can significantly affect the composite properties [36]. The increased surface area provides greater interfacial area for interaction with the polymer matrix in a composite.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of TiO₂ nanofibre/cellulose acetate nanocomposite ultrafiltration membrane

Neelapala

Nair

JagadeeshBabu

2017

Journal of Experimental Nanoscience

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Nanofibres of TiO 2 were synthesised by hydrothermal routine. Cellulose acetate/TiO 2 nanofibre composite membranes were synthesised via blending TiO 2 nanofibre in cellulose acetate solutions in 1-methyl-2-pyrrolidone. In order to study the effect of addition of nanofibre, membranes with various composition were synthesised, first by keeping cellulose acetate to 1-methyl-2pyrrolidone ratio constant and second by decreasing cellulose acetate concentration with increasing addition of TiO 2 nanofibre. The membranes were characterised using scanning electron microscope and X-ray diffraction. Hydrophilicity of the membranes was evaluated in terms of contact angle measurements and water uptake study. Permeation characteristics were determined in terms of pure water flux and bovine serum albumin rejection. Antifouling property was studied in terms of flux recovery after rejection. Remarkable improvement in membrane flux and antifouling properties is achieved by the addition of TiO 2 nanofibres.

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“…Continuum mechanics approaches based on the finite element method have been used extensively to evaluate the elastic properties of CNT-based composites. For example, Gawandi and colleagues addressed the problem of a single nano-fiber interacting with a crack [23,24]. However, these works are limited because the atomistic structure of the nanotube has been neglected in the formulation of the finite element model.…”

Section: Introductionmentioning

confidence: 99%

A Finite Element Study of Crack Behavior for Carbon Na-notube Reinforced Bone Cement

Saffar¹,

Najafi²,

Moeinzadeh³

et al. 2013

WJM

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Polymethylmethacrylate (PMMA) bone cement is a polymeric material that is widely used as a structural orthopedic material. However, it is not an ideal material for bone grafting due to its fragility. Carbon nanotubes (CNTs) have been introduced in order to reinforce PMMA resulting in a composite material which exhibits improved tensile properties, increased fatigue resistance and fracture toughness. This improvement is potentially due to bridging and arresting cracks as well as absorption of energy. In this study, a two-dimensional finite element model is presented for the fracture analysis of PMMA-CNT composite material. Instead of the classical single fiber model, the present work considers an ensemble of CNTs interacting with a pre-existing crack. Casca is used to produce a two dimensional mesh and the fracture analysis is performed using Franc 2D. The model is subjected to uni-axial loading in the transverse plane and the interaction between the crack and CNTs is evaluated by determining the stress intensity factor in the vicinity of the crack tips. The effects of geometric parameters of the CNTs and the material structural heterogeneity on crack propagation trajectory are investigated. Furthermore, the effects of CNT diameter, wall thickness and elastic mismatch between the matrix and the nanotubes on crack growth are studied. The results illustrate that the CNTs repel cracks during loading as they act as barriers to crack growth. As a result, the incorporation of CNTs into PMMA reduces crack growth but more importantly increases the fracture resistance of bone cement.

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Three-dimensional analysis of the interaction between a matrix crack and nanofiber

Cited by 9 publications

References 23 publications

Engineering Chemistry of Electrospun Nanofibers and Interfaces in Nanocomposites for Superior Mechanical Properties

Engineering Chemistry of Electrospun Nanofibers and Interfaces in Nanocomposites for Superior Mechanical Properties

Synthesis and characterisation of TiO₂ nanofibre/cellulose acetate nanocomposite ultrafiltration membrane

A Finite Element Study of Crack Behavior for Carbon Na-notube Reinforced Bone Cement

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Three-dimensional analysis of the interaction between a matrix crack and nanofiber

Cited by 9 publications

References 23 publications

Engineering Chemistry of Electrospun Nanofibers and Interfaces in Nanocomposites for Superior Mechanical Properties

Engineering Chemistry of Electrospun Nanofibers and Interfaces in Nanocomposites for Superior Mechanical Properties

Synthesis and characterisation of TiO2 nanofibre/cellulose acetate nanocomposite ultrafiltration membrane

A Finite Element Study of Crack Behavior for Carbon Na-notube Reinforced Bone Cement

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Product

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Synthesis and characterisation of TiO₂ nanofibre/cellulose acetate nanocomposite ultrafiltration membrane