Optimizing strength and toughness of nanofiber-reinforced CMCs

Pavia, F.

doi:10.1016/j.jmps.2012.04.005

Cited by 15 publications

(9 citation statements)

References 36 publications

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“…Recently, multiple micro-cracks bridged by boron nitride nanotubes have been found in brittle matrix composites [67]. Secondly, the Lawrence model [10], which has been used to establish the bridging law by Chen et al [16,17],andalsousedbyPaviaandCurtin [18], is based on the deformation and load transfer of a concentric cylinder where a fibre of a circular cross section is embedded in an outer cylindrical matrix shell. This is probably the most widely used configuration in various shear-lag models since the work of Cox [68].…”

Section: Bridging Lawsmentioning

confidence: 99%

“…Chen et al [15] used a 'virtual matrix radius' r m , which is a rather large value. Pavia and Curtin [18] suggested that r f /r m = √ V f , by assuming that the volume fraction V f of the fibre in a composite material can be represented by that in the concentric cylindrical unit cell. It is immediately seen that R will become a complex number when V f > V fcr ≡ E m /E f , and so are the displacements and stresses obtained from the shear-lag model.…”

Section: Bridging Lawsmentioning

confidence: 99%

“…It is found that the curvature generally decreases the fracture energy. Pavia and Curtin [18] predicted the strength and work of fracture of a nanofibre-reinforced ceramic composite characterized by a single crack bridged by wavy short nanofibres. A bridging law was developed using a shear-lag model of a unit cell, similar to the work of Chen et al [16,17], following the Lawrence shear-lag model [10].…”

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confidence: 99%

“…The strength of the nanofibre was characterized by a Weibull distribution. The salient finding of Pavia and Curtin [18] is that there is an optimum combination of the length and radius of curvature of the CNTs which can maximize the strength and toughness of the composite.…”

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confidence: 99%

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A bridging law and its application to the analysis of toughness of carbon nanotube-reinforced composites and pull-out of fibres grafted with nanotubes

2015

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Bridging laws are essential in predicting the mechanical behaviour of conventional short-fibrereinforced composites and the emerging nanofibre-reinforced composites. In this paper, we first review some studies on the toughness of carbon nanotube-reinforced composites that is induced by the pull-out of the nanotubes from the matrix, and on the development of the corresponding bridging laws. A close examination of the available bridging laws for carbon nanotubes reveals that some fundamental issues need to be further addressed. We propose a simple nonlinear and smooth bridging law to describe the pull-out force-displacement behaviour of carbon nanotubes from a matrix. This law contains only two material parameters, reflects the basic features of the pull-out experiments, and is easy to use. We then use this bridging law to calculate the fracture toughness of carbon nanotube-reinforced nanocomposites and predict the pull-out force-displacement response of conventional short fibres that are grafted with carbon nanotubes. Some parametric studies are conducted to reveal the influence of various parameters at the nano-and micro-scale on these properties.

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Section: Bridging Lawsmentioning

confidence: 99%

Section: Bridging Lawsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A bridging law and its application to the analysis of toughness of carbon nanotube-reinforced composites and pull-out of fibres grafted with nanotubes

2015

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“…In practice, CNT coated carbon fibers may not touch each other laterally and the resulting composite will be composed of three phases; namely, the carbon fiber, the CNT-reinforced polymer matrix nanocomposite (PMNC), and the polymer matrix. Pavia and Curtin [39] developed a shear lag model for a "fuzzy fiber" ceramic matrix composite containing wavy, finite length nanofibers having a statistical distribution of strengths as a function of all the material parameters, including morphology.…”

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Shear Lag Model for Regularly Staggered Short Fuzzy Fiber Reinforced Composite

Kundalwal

Ray

Meguid

2014

Journal of Applied Mechanics

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In this article, we investigate the stress transfer characteristics of a novel hybrid hierarchical nanocomposite in which the regularly staggered short fuzzy fibers are interlaced in the polymer matrix. The advanced fiber augmented with carbon nanotubes (CNTs) on its circumferential surface is known as “fuzzy fiber.” A three-phase shear lag model is developed to analyze the stress transfer characteristics of the short fuzzy fiber reinforced composite (SFFRC) incorporating the staggering effect of the adjacent representative volume elements (RVEs). The effect of the variation of the axial and lateral spacing between the adjacent staggered RVEs in the polymer matrix on the load transfer characteristics of the SFFRC is investigated. The present shear lag model also accounts for the application of the radial loads on the RVE and the radial as well as the axial deformations of the different orthotropic constituent phases of the SFFRC. Our study reveals that the existence of the non-negligible shear tractions along the length of the RVE of the SFFRC plays a significant role in the stress transfer characteristics and cannot be neglected. Reductions in the maximum values of the axial stress in the carbon fiber and the interfacial shear stress along its length become more pronounced in the presence of the externally applied radial loads on the RVE. The results from the newly developed analytical shear lag model are validated with the finite element (FE) shear lag simulations and found to be in good agreement.

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An improved pull‐out model for the carbon nanotube/nanofiber‐reinforced polymer composites with interfacial defects

Chen

Yang

2014

Polymer Composites

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The procedure of pulling a carbon nanotube/nanofiber (CNT/CNF) with interfacial defect out from a polymer matrix is studied in this article. By ignoring the fibermatrix interaction and the stress concentration in the zone of interfacial defect, an analytical model is proposed to describe the pull-out behavior of the CNT/ CNF. The accuracy and rationality of the model is validated by comparing to the pull-out experiment and the finite element simulation. The results from the parametric study indicate that the geometric parameters of the interfacial defect have pronounced influences on the pull-out behavior of the CNT/CNF. The influence of the defect on the strength and toughness of the composites is discussed in detail. POLYM. COMPOS.,

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Optimizing strength and toughness of nanofiber-reinforced CMCs

Cited by 15 publications

References 36 publications

A bridging law and its application to the analysis of toughness of carbon nanotube-reinforced composites and pull-out of fibres grafted with nanotubes

A bridging law and its application to the analysis of toughness of carbon nanotube-reinforced composites and pull-out of fibres grafted with nanotubes

Shear Lag Model for Regularly Staggered Short Fuzzy Fiber Reinforced Composite

An improved pull‐out model for the carbon nanotube/nanofiber‐reinforced polymer composites with interfacial defects

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