Measurement of stress concentration around fibre breaks in carbon-fibre/epoxy-resin composite tows

Marston, Christian; Gabbitas, Brian; Adams, J. Gordon; Marshall, P.; Galiotis, Costas

doi:10.1016/s0266-3538(97)00015-8

Cited by 17 publications

(3 citation statements)

References 18 publications

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“…In Figure 7, the stress‐concentration factor in the neighboring fiber is plotted with respect to the distance to the fiber break plane for various debond lengths. Experimental investigations by means of micro‐Raman spectroscopy support the calculated stress concentration in the adjacent fiber 30–32. The elastic case with no debonding gives the highest stress concentration in the adjacent fiber with a value of Σ = 1.3334.…”

Section: Numerical Simulationsupporting

confidence: 55%

Effects of debonding and fiber strength distribution on fatigue-damage propagation in carbon fiber-reinforced epoxy

Gamstedt

2000

J. Appl. Polym. Sci.

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In order to design new fatigue-resistant composites, the underlying fatigue damage mechanisms must be characterized and the controlling microstructural properties should be identified. The fatigue-damage mechanisms of a unidirectional carbon fiber-reinforced epoxy has been studied under tension-tension loading. A ubiquitous form of damage was one or a few planar fiber breaks from which debonds or shear yield zones grew in the longitudinal direction during fatigue cycling. This leads to a change in stress profile of the neighboring fibers, and an increase in failure probability of these fibers. The breakage of fibers in the composite is controlled by the fiber strength distribution. The interaction between the fiber strength distribution and debond propagation leading to further fiber breakage was investigated by a numerical simulation. It was found that a wider distribution of fiber strength and a higher debond rate lead to more distributed damage and a higher fracture toughness. Implications to fatigue life behavior are discussed, with reference to constituent microstructure.

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Section: Numerical Simulationsupporting

confidence: 55%

Effects of debonding and fiber strength distribution on fatigue-damage propagation in carbon fiber-reinforced epoxy

Gamstedt

2000

J. Appl. Polym. Sci.

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“…Previous experimental work has focused on single fibres [26][27][28][29][30] or model composites, analysed using scanning or Raman microscopy [30][31][32]. Their restriction to surface observations does not permit measurement of the bulk composite without sectioning, which has the inherent risk of introducing additional damage.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron radiation computed tomography for experimental validation of a tensile strength model for unidirectional fibre-reinforced composites

Swolfs

Morton

Scott

et al. 2015

Composites Part A: Applied Science and Manufacturing

103

151

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“…4) at the surface of an impregnated fibre tow was mapped at an applied strain level of 0.5% with the Raman microprobe. 27 The centre-to-centre fibre distance between the fibres was approximately equal to 10.8 µm. Fibre failure occurred in fibre 4, as indicated in Fig.…”

Section: Stress Mapping and Iss Distribution In Composite Towsmentioning

confidence: 99%

Unification of fibre/matrix interfacial measurements with Raman microscopy

Galiotis

Paipetis

Marston

1999

J. Raman Spectrosc.

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The effect of specimen geometry upon the parameters that govern the stress transfer (transfer length, interfacial shear strength, positively affected length and stress concentration factor) in a carbon fibre/epoxy composite was examined in detail. Five frequently employed composite geometries were considered: single fibre composite coupons incorporating discontinuous and continuous carbon fibres, multi-fibre composite tapes with a controlled inter-fibre separation, four-ply unidirectional coupons, and, finally, impregnated fibre tows. The chemistry and the curing characteristics of the matrix were kept unaltered regardless of specimen geometry. All fibre stress measurements were conducted by means of Raman microscopy.The experimental results showed that the transfer length, positively affected length (PAL) and the interfacial shear stress obtained at the location of a fibre fracture are not considerably affected by specimen geometry. In contrast, the residual fibre stress of the unloaded specimens and the stress concentration factors obtained in fibres adjacent to a fibre fracture site were found to be significantly dependent upon fibre volume fraction and specimen geometry. Figure 2. Schematic of the single (a) continuous and (b) discontinuous fibre coupon geometries.

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Measurement of stress concentration around fibre breaks in carbon-fibre/epoxy-resin composite tows

Cited by 17 publications

References 18 publications

Effects of debonding and fiber strength distribution on fatigue-damage propagation in carbon fiber-reinforced epoxy

Effects of debonding and fiber strength distribution on fatigue-damage propagation in carbon fiber-reinforced epoxy

Synchrotron radiation computed tomography for experimental validation of a tensile strength model for unidirectional fibre-reinforced composites

Unification of fibre/matrix interfacial measurements with Raman microscopy

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