Non-Hookean Behaviour of Strong Carbon Fibres

Curtis, G.J.; Milne, J.M.; Reynolds, W. N.

doi:10.1038/2201024a0

Cited by 115 publications

(45 citation statements)

References 6 publications

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“…This nonlinearity differs from the observations in Ref. [14], and it is usually explained as the result of buckling of the graphite layers on the compression side of a fiber. Its dependence on the type of fiber precursor, heat treatment temperature, and microstructure has been extensively studied [15][16][17][18].…”

Section: Introductioncontrasting

confidence: 51%

Failure of Carbon Fibers at a Crease in a Fiber-Reinforced Silicone Sheet

Jiménez

Pellegrino

2012

Journal of Applied Mechanics

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Thin sheets of unidirectional carbon fibers embedded in a silicone matrix can be folded to very high curvatures, as elastic microbuckles with a half-wavelength on the order of 1 mm decrease the maximum strain in the fibers near the compression surface. This paper shows that probabilistic failure models derived from tension tests on individual fibers can be used to predict accurately the value of the outer surface curvature of the sheet, at which a small percentage of fibers break when a crease is formed in the sheet. The most accurate results are obtained by using a strain-based Weibull distribution of the failure probability in tension.

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Section: Introductioncontrasting

confidence: 51%

Failure of Carbon Fibers at a Crease in a Fiber-Reinforced Silicone Sheet

Jiménez

Pellegrino

2012

Journal of Applied Mechanics

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“…According to the literature, the stiffness of carbon fibres generally increases with increasing strain [21,24,[30][31][32]. This phenomenon was found to be entirely reversible and is attributed to orientation of the lamellar crystallites.…”

Section: Carbon Fibresmentioning

confidence: 96%

The influence of non-linear elasticity on the determination of Weibull parameters using the fibre bundle tensile test

Möser

Weber

Rossoll

et al. 2003

Composites Part A: Applied Science and Manufacturing

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We address the influence of individual fibre stress-strain non-linearity on the extraction of Weibull-parameters from fibre bundle tensile tests. We extend the statistical theory of fibre bundle strength to include the non-linear elastic behaviour observed in many technically important fibres, e.g. glass-, carbon-, and alumina-fibres. It is shown that neglecting this non-linearity may lead to significant errors in determining the shape and scale parameters of the fibre fracture strength Weibull-distribution. A refinement of the existing extraction technique, accounting for this effect, is presented. The error resulting from neglecting the non-linear behaviour is assessed through a parametric study of the Weibull parameters for different levels of non-linearity. Explicit calculations are performed for two fibres of technical importance, namely Nextel 610e a-alumina fibre and a T300 carbon fibre. q

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“…The fractional change in resistance of a fi ber versus strain graphs showed a small initial curvature followed by a long straight region. It has been shown [ 13 ] that the crystallites in carbon fi bers become more highly oriented when the fi ber is strained. The graphite crystallite has marked electrical anisotropy, the resistivity parallel to the c axis being of the order of 10 3 times the resistivity perpendicular to the c axis; consequently any reorientation during straining will have a marked in fl uence on the electrical resistance of fi bres.…”

Section: Self-sensing System For Unidirectional Cfrp Wiresmentioning

confidence: 99%

20 Years of Experience with Structural Health Monitoring of Objects with CFRP Components

et al. 2011

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The application of carbon fi ber reinforced polymers (CFRP) in bridge construction was before 1991 unknown. Therefore the bridge owners did not want to rely only on the laboratory experiments made in the 1980ties. They asked for structural health monitoring. This was also in the interest of the involved R&D community. The used devices range from "old fashioned" demec gauges for off-line measurements to classical foil resistance strain gauges, self-sensing systems for unidirectional CFRP wires, and also sophisticated integrated fi ber optical sensors with Bragg gratings. In the most important applications different independent systems were used in parallel. Twenty years are for devices which are exposed to outdoor weathering a fairly demanding time span. Therefore the surprisingly high reliability of most of these systems is a largely appreciated result. Applications on post-tensioned reinforced concrete bridges, stay cables, and pretensioned powerline pylons will be discussed.

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Non-Hookean Behaviour of Strong Carbon Fibres

Cited by 115 publications

References 6 publications

Failure of Carbon Fibers at a Crease in a Fiber-Reinforced Silicone Sheet

Failure of Carbon Fibers at a Crease in a Fiber-Reinforced Silicone Sheet

The influence of non-linear elasticity on the determination of Weibull parameters using the fibre bundle tensile test

20 Years of Experience with Structural Health Monitoring of Objects with CFRP Components

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