Carbon fibres: structure and mechanical properties

Kobets, L. P.; Deev, I. S.

doi:10.1016/s0266-3538(97)00088-2

Cited by 43 publications

(30 citation statements)

References 2 publications

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“…The pitch fibres are larger, with mean diameters around 10.5μm. It has been noted elsewhere that the modulus of PAN carbon fibres increases as section decreases [24]. The interface areas for pitch fibres are much larger.…”

Section: Transverse Tensile Properties (Unidirectional Ply)mentioning

confidence: 75%

Transverse Properties of Carbon Fibres by Nano-Indentation and Micro-mechanics

et al. 2008

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In this study the transverse modulus of three high modulus (M40, M46 and K63712) carbon fibres has first been measured directly by nano-indentation measurements. Transverse tensile tests on unidirectional epoxy composites were then performed, and the comparison was made between transverse fibre properties from indentation and those needed to obtain the measured transverse composite modulus using micromechanics expressions. The latter tended to underestimate values from indentation, by up to 36%, and reasons for this are discussed. Values of transverse fibre modulus determined by both methods decrease as longitudinal fibre modulus increases.

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Section: Transverse Tensile Properties (Unidirectional Ply)mentioning

confidence: 75%

Transverse Properties of Carbon Fibres by Nano-Indentation and Micro-mechanics

et al. 2008

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“…It may only be mentioned that lithiation mechanisms in graphite and disordered carbons were investigated in previous research [28][29][30][31][32][33]. Several authors report that the intercalation of Li in the ordered part of the carbon, i.e., between the layers of graphite crystallites, may occur more easily and prior to intercalation in the disordered areas (such as microvoids and amorphous carbon matrix where large amount of Li can also be accommodated and which could have a mass fraction in the order of 0.5 [19]). Therefore, the crystal structure which is driving failure might be likely to be saturated before the fibre is fully lithiated, but there is no clear evidence.…”

Section: Discussion Of the Possible Mechanisms Governing The Strengthmentioning

confidence: 99%

“…PAN-based CFs can be seen as having a microcomposite structure, made of turbostratic folded and interlinked carbon layers forming fibrils of graphitic crystallites almost aligned with the fibre axis and immersed in a micromatrix of quasi-amorphous carbon [19]. Useful lamellar models based on the microtexture of the CFs explaining the experimental data and tensile properties can be found [20,21].…”

Section: Discussion Of the Possible Mechanisms Governing The Strengthmentioning

confidence: 99%

The effect of lithium-intercalation on the mechanical properties of carbon fibres

Jacques

Kjell

Zenkert

et al. 2014

Carbon

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The effect of lithium-intercalation on the mechanical properties of carbon fibres. , 68: 725-733 http://dx.doi.org/10.1016/j.carbon. 2013.11.056 Access to the published version may require subscription. Carbon AbstractCarbon fibres (CFs) can be used as lightweight structural electrodes since they have high specific tensile stiffness and ultimate tensile strength (UTS), and high lithium (Li)-intercalation capability. This paper investigates the relationship between the amount of intercalated Li and the changes induced in the tensile stiffness and UTS of polyacrylonitrilebased CF tows. After a few electrochemical cycles the stiffness was not degraded and independent of the measured capacity. A drop in the UTS of lithiated CFs was only partly recovered during delithiation and clearly larger at the highest measured capacities, but remained less than 40% at full charge. The reversibility of this drop with the C-rate and measured capacity supports that the fibres are not damaged, that some Li is irreversibly trapped in the delithiated CFs and that reversible strains develop in the fibre. However, the drop in the strength does not vary linearly with the measured capacity and the drop in the ultimate tensile strain remains lower than the CF longitudinal expansion at full charge. These results suggest that the loss of strength might relate to the degree of lithiation of defectives areas which govern the tensile failure mode of the CFs.

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“…Meanwhile, the weight reduction of the composite structure is also a critical factor that should be consid ered, especially for the aerospace and automotive utilizations. To meet the two aspects, carbon fiber is a very favorable choice, owing to its attractive characteristics of high stiffness, high strength, and light weight [6][7][8][9]. In many applications, carbon fibers are mixed into a thermosetting polymer matrix (e.g., epoxy ' resin) with a good thermal stability and chemical resistance to produce carbon fiber-reinforced epoxy composite, which is a typical representative of advanced composites and widely used in aeronautical, marine, and automobile industries [1,10,11].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Longitudinal Surface Roughness on Fiber Pull-Out Behavior in Carbon Fiber-Reinforced Epoxy Resin Composites

Yin¹,

Chen

2013

Journal of Applied Mechanics

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Surface modifications are known as efficient technologies for advanced carbon fibers to achieve significant improvement of inteiface adhesion in composites, one of which is to increase the surface roughness in the fiber's longitudinal direction in practice. As a result, many microridges and grooves are produced on carbon fiber's surfaces. How does the surface roughness influence the carbon fiber's pull-out behavior? Are there any restrictions on the relation between the aspect ratio and suiface roughness of fibers in order to obtain an optimal interface? Considering the real morphology on carbon fiber's swface, i.e., longitudinal roughness, an improved shear-lag theoretical model is developed in this paper in order to investigate the interface characteristics and fiber pull-out for carbon fiber-reinforced thermosetting epoxy resin (brittle) composites. Closed-form solutions to the carbon fiber stress are obtained as well as the analytical loaddisplacement relation during pullout, and the apparent interfacial shear strength (IFSS). It is found that the interfacial adhesion and the apparent IFSS are effectively strengthened and improved due to the suiface roughness of carbon fibers. Under a given tensile load, an increasing roughness will result in a decreasing fiber stress in the debonded zone and a decreasing debonded length. Furthermore, it is interesting to find that, for a determined suiface roughness, an optimal aspect ratio, about 30^45, cjf carbon fibers exists, at which the apparent IFSS could achieve the maximum. Comparison to the existing experiments shows that the theoretical model is feasible and reasonable to predict the experimental results, and the theoretical results should have an instructive significance for practical designs of carboniepoxy composites.

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Carbon fibres: structure and mechanical properties

Cited by 43 publications

References 2 publications

Transverse Properties of Carbon Fibres by Nano-Indentation and Micro-mechanics

Transverse Properties of Carbon Fibres by Nano-Indentation and Micro-mechanics

The effect of lithium-intercalation on the mechanical properties of carbon fibres

Effects of the Longitudinal Surface Roughness on Fiber Pull-Out Behavior in Carbon Fiber-Reinforced Epoxy Resin Composites

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