Strength-structure relationships in PAN-based carbon fibres

Bennett, S.C.; Johnson, D. J.; Johnson, WS

doi:10.1007/bf00544159

Cited by 143 publications

(36 citation statements)

References 15 publications

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“…At the ®rst increment of strain at which measurements were taken, a small degree of debonding was already present at the fragment-ends of the ®bres coated with acrylic acid plasma homopolymer (0. 29 . At a strain level of 10%, representative stress birefringence patterns associated with ®bre-fracture, transverse matrix cracking, and interfacial debonding for the differing plasma-copolymer-coated ®bres is given in Figure 6.…”

Section: Fragmentation Test Resultsmentioning

confidence: 95%

Stress Transfer Function for Interface Assessment in Composites with Plasma Copolymer Functionalized Carbon Fibres

Lopattananon¹,

Hayes²,

Jones³

2002

The Journal of Adhesion

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Radio-frequency-induced plasma copolymerization of acrylic acid=1,7-octadiene was used to produce a range of functionalized plasma copolymer coatings with controlled degree of adhesion. The single-®bre fragmentation test was used to characterize the adhesion of plasma copolymer coated ®bres to epoxy resin. The cumulative stress transfer function (CSTF) and Kelly-Tyson approaches were used to evaluate the degree of adhesion. By continuous monitoring of the fragmentation process, it was found that the mechanical performance of a composite material could be evaluated using the CSTF methodology at strain well below saturation. The degree of debonding was a good measure of relative interface=interphase adhesive strength. The trend in the CSTF is consistent with the propagation of interfacial debonds during the test. For a completely debonded ®bre a normalized CSTF value, referred as stress transfer ef®ciency (STE), was found to provide a more consistent analysis that was able to differentiate between ®bres with similar degrees of debonding. The calculated values of interfacial shear strength (IFSS) were only valid for a fully debonded ®bre (1,7-octadiene plasma homopolymer coating) where the assumption of a constant shear stress, as in the Kelly-Tyson model, applied. However, IFSS did not provide the same ranking. Where debonding does not occur, the stress transfer ef®ciency also provides a sensitive measure of the interface=interphase performance. Improved adhesion over the untreated-unsized carbon ®bre was observed for both of the plasma copolymercoated and commercially treated carbon ®bres. Since there is a concentration dependence of carboxyl groups on adhesion, the mechanism appears to relate to covalent bond formation with the epoxy group. Plasma copolymer coatings on carbon ®bres also causes an increased tensile strength and Weibull modulus.

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Section: Fragmentation Test Resultsmentioning

confidence: 95%

Stress Transfer Function for Interface Assessment in Composites with Plasma Copolymer Functionalized Carbon Fibres

Lopattananon¹,

Hayes²,

Jones³

2002

The Journal of Adhesion

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“…However, the electrical conductivity of carbon fiber-reinforced paper was higher than that of activated carbon fiber-reinforced paper. The carbon fiber used in this study (S-231) is an anisotropic carbon fiber with graphene, which is the fundamental structure of graphite, arranged parallel with the direction of the fiber [24]. Hence, the electrical conductivity of S-231 is excellent.…”

Section: Electrical Conductivity Of the Reinforced Papermentioning

confidence: 99%

Physical property and electrical conductivity of electroless Ag-plated carbon fiber-reinforced paper

Jang

Ryu

2006

Journal of Materials Processing Technology

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“…In a fairly recent study of tensile failure (Bennett et al, 1983), specimens from an old batch of Type I PAN-based carbon fibres containing many flaws, were stressed to failure in glycerol. This enabled the fracture ends to be preserved intact for subsequent examination, first by SEM, and then, after embedding and sectioning, by TEM.…”

Section: Fracture Mechanics 51 Tensile Failurementioning

confidence: 99%

Carbon Fibres: Manufacture, Properties, Structure and Applications

Johnson

1989

Introduction to Carbon Science

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Strength-structure relationships in PAN-based carbon fibres

Cited by 143 publications

References 15 publications

Stress Transfer Function for Interface Assessment in Composites with Plasma Copolymer Functionalized Carbon Fibres

Stress Transfer Function for Interface Assessment in Composites with Plasma Copolymer Functionalized Carbon Fibres

Physical property and electrical conductivity of electroless Ag-plated carbon fiber-reinforced paper

Carbon Fibres: Manufacture, Properties, Structure and Applications

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