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

Maurin, Romain; Davies, Peter; Baral, Nicolas; Baley, Christophe

doi:10.1007/s10443-008-9057-3

Cited by 68 publications

(46 citation statements)

References 30 publications

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“…Based on these results, the following experiments were performed under the conditions of h i = 360°, l = 10 mm, and with a sizing agent. Figure 7 presents the experimentally measured G 23 values as a function of the tensile modulus E. This figure also plots reference values from [4,19,21,[30][31][32]. The G 23 values for each kind of fiber measured in this study were found to be comparable to the reference values.…”

Section: Resultsmentioning

confidence: 86%

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Torsional modulus and internal friction of polyacrylonitrile- and pitch-based carbon fibers

et al. 2015

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In the present work, the torsional modulus and internal friction of different types of polyacrylonitrile (PAN)-and pitch-based carbon fibers were measured with the torsional pendulum method to evaluate the relationship between these properties and the microstructure of carbon fibers. For easier and more accurate measurement, an aluminum disk-type pendulum was used. The measured torsional moduli were comparable to the previously reported values, which indicates the validity of the proposed method. The experimental results and discussion based on Eshelby's solution and Mori-Tanaka's mean stress method revealed that the torsional modulus should have a significant relation to the volume fraction of the crystalline region in the fibers and amorphous modulus. The results imply that fibers with a smaller crystalline region and higher amorphous modulus should show a higher torsional modulus. The internal friction of the fibers increased with the torsional modulus. This suggests that the internal friction may also be related to the size of the crystalline region and that the amorphous region has greater internal friction than the crystalline region.

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Section: Resultsmentioning

confidence: 86%

“…Some studies have predicted the longitudinal shear modulus G 23 , where the subscripts 2 and 3 denote the radial and axial direction, using calculation models based on the microstructure of carbon fibers [4,19,20]. Other studies have measured the modulus orthogonal to the fiber axis using nanoindentation [21].…”

Section: Introductionmentioning

confidence: 99%

Torsional modulus and internal friction of polyacrylonitrile- and pitch-based carbon fibers

et al. 2015

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“…These values are well below typical axial properties measured for PAN-based carbon fibres [39], but in the same range as the transverse indentation modulus of 15 GPa of PAN-derived carbon fibres [40] or the hardness (0.46 GPa) and indentation modulus (11.9 GPa) of the carbon matrix in carbon/carbon composites [41]. It can thus be concluded that the mechanical performance of particulate carbon derived from kraft-lignin is at least in a similar range as fossil-derived randomly oriented carbon.…”

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confidence: 69%

Electrically conductive kraft lignin-based carbon filler for polymers

Gindl‐Altmutter

Fürst

Mahendran

et al. 2015

Carbon

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“…As misalignment describes fiber deviation from an ideal alignment, the characteristic parameter is the fiber orientation angle, h, which is usually measured as a scatter (Li et al, 2016;Maurin et al, 2008;Requena et al, 2009). Waviness and wrinkling, on the other hand, describe fiber undulation either in-plane, or through-the-thickness of the composite.…”

Section: Preform Defects In Lcmmentioning

confidence: 99%

Process Induced Defects in Liquid Molding Processes of Composites

Hamidi

Altan

2017

International Polymer Processing

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Liquid Composite Molding (LCM) processes are cost efficient manufacturing alternatives to traditional autoclave technology for producing near-net shape structural composite parts. However, process induced defects often limit wider usage of LCM in structural applications. Thorough knowledge of these defects, as well as their formation mechanisms and prevention techniques, is essential in developing improved LCM processes. In this article, process induced defects in liquid molding processes of composites, categorized into preform, flow induced and cure induced defects, are reviewed. Preform defects are further presented as fiber misalignment and fiber undulation (waviness and wrinkling). The respective causes, detrimental effects, and possible prevention methods of these defects are presented. Thereafter, flow induced defects are classified as voids and dry spots. Dry spot formation mechanisms in LCM processes and available prevention techniques are summarized. In addition, void formation mechanisms, adverse effects on composite properties, and removal techniques are presented. Cure induced defects include microcracks, void growth and geometrical distortions (warpage and spring-in). Each of these defects are discussed along with their underlying causes as well as their control and reduction schemes.

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

Cited by 68 publications

References 30 publications

Torsional modulus and internal friction of polyacrylonitrile- and pitch-based carbon fibers

Torsional modulus and internal friction of polyacrylonitrile- and pitch-based carbon fibers

Electrically conductive kraft lignin-based carbon filler for polymers

Process Induced Defects in Liquid Molding Processes of Composites

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