Tensile strength and its variation for PAN‐based carbon fibers. II. Calibration of the variation from testing

Jiangwei, Yao; Yu, Weidong

doi:10.1002/app.24455

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…The elimination of weak fibre strengths would result in an incomplete data set which does not represent the entire fibre population correctly. 12,43…”

Section: Fibre Strength Characterisationmentioning

confidence: 99%

Investigation of tensile strength and dimensional variation of T700 carbon fibres using an improved experimental setup

Islam

Joannès

Bucknell³

et al. 2019

Journal of Reinforced Plastics and Composites

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Knowledge of fibre strength is crucial for understanding the failure behaviour of fibre-reinforced composite materials and structures. Measuring the properties of technical fibres has been known to be very challenging, and the different challenges associated with single fibre characterisation are illustrated in this article. An improved and automated experimental methodology for tensile testing of single fibres is described. This process has been used to generate fibre strength data for T700 carbon fibres at three different gauge lengths of 4, 20 and 30 mm. The variability in strength and modulus of short fibres was found to be much larger than that of longer fibres. Statistical analysis of this large data set has also highlighted the limitations of the standard Weibull distribution for representing fibre strength behaviour. The need for a better statistical representation of the fibre strength data in order to provide a more accurate description of the fibre strength behaviour has been emphasized.

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“…The elimination of weak fibre strengths would result in an incomplete data set which does not represent the entire fibre population correctly. 12,43…”

Section: Fibre Strength Characterisationmentioning

confidence: 99%

Investigation of tensile strength and dimensional variation of T700 carbon fibres using an improved experimental setup

Islam

Joannès

Bucknell³

et al. 2019

Journal of Reinforced Plastics and Composites

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“…Such small fibres lead to low breaking forces. A typical breaking force for a high strength carbon fibre is 0.15 N. It is therefore not unlikely that some fibres break during the extraction from the bundle or during the cutting of the frame [30,46,71]. The elimination of the weakest fibres causes deviations from linearity in Weibull plots [47].…”

Section: Fibre Preselectionmentioning

confidence: 99%

“…An ideal single fibre test would have a uniform tensile stress over the entire gauge length, and zero tensile stress outside of the gauge length. Clamping effects, which are defined here as deviations from this ideal scenario, always occur in single fibre testing (see Figure 2b) [40,60,71,74]. These effects are particularly pronounced at small gauge lengths for several reasons [74].…”

Section: Clamping Effects In Single Fibre Testsmentioning

confidence: 99%

A review of input data and modelling assumptions in longitudinal strength models for unidirectional fibre-reinforced composites

Swolfs

Verpoest

Gorbatikh

2016

Composite Structures

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Fibre-reinforced composites are rapidly increasing their market share in structural applications. Nevertheless, this increase would be much stronger if reliable failure predictions were available. These predictions are not only insufficiently reliable for complex loading of multidirectional composites, but even for longitudinal tensile failure of unidirectional (UD) composites. Since composite failure usually coincides with longitudinal failure of a 0° ply, the reliability often hinges on longitudinal failure predictions of UD composites. Despite great progress in the state-of-the-art models, significant obstacles remain in collecting the necessary input data and understanding the influence of the modelling assumptions. This review therefore surveys the mechanics, chemistry and physics involved in tensile failure of UD composites and highlights potential areas for improvement. Specific proposals are made to advance the state-of-the-art strength models, which could catalyse the use of composites in structural applications.

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“…As of today, there are three distinct ways to characterize the fibre properties. Either, the fibres are tested as such, using single fibre tensile tests (SFT) 1 or dry fibre bundle tests. 2 Alternatively, the fibre properties are back-calculated from the results of the impregnated fibre bundle test (IFBT).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, a very large number of individual fibres have to be tested to provide statistically reliable results. 1,5…”

Section: Introductionmentioning

confidence: 99%

Impregnated fibre bundle test for natural fibres used in composites

Bensadoun

Verpoest

Baets

et al. 2017

Journal of Reinforced Plastics and Composites

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In this study, the impregnated fibre bundle test, a common method used by carbon and glass fibre manufacturers to determine the properties of fibres used in composites, was adapted for natural fibres and validated by a round robin test on one type of natural fibres, namely flax fibres. Five European laboratories have carried out in parallel the impregnated fibre bundle test, on the same batch of hackled flax (long fibres), to check the applicability and reliability of this modified method on natural fibres. The results were compared to the more traditional single fibre test on elementary fibres. The back-calculated fibre stiffness shows a very low scatter between the five laboratories of less than ±5% (59.8 ± 2.4 GPa, as measured between 0 and 0.1% strain). The fibre ultimate tensile strength of 527 ± 138 MPa has a higher scatter, compared to stiffness values, as this property is highly sensitive to imperfections and flaws.

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Tensile strength and its variation for PAN‐based carbon fibers. II. Calibration of the variation from testing

Cited by 15 publications

References 10 publications

Investigation of tensile strength and dimensional variation of T700 carbon fibres using an improved experimental setup

Investigation of tensile strength and dimensional variation of T700 carbon fibres using an improved experimental setup

A review of input data and modelling assumptions in longitudinal strength models for unidirectional fibre-reinforced composites

Impregnated fibre bundle test for natural fibres used in composites

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