Investigation of morphology-dependent fracture behaviour with the single-fibre pull-out test

Meretz, Stefan; Auersch, W.; Marotzke, Christian; Schulz, E.; Hampe, A.

doi:10.1016/0266-3538(93)90145-7

Cited by 44 publications

(42 citation statements)

References 6 publications

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“…2B). 41 Both IFSS and DLR were significantly improved by the presence of the nanostructured coating, relative to the control fibers, reaching maxima of 59.5 AE 3.9 MPa (+84%) and 0.17 AE 0.02 (+89%), respectively, for the fibers coated with a 0.4 mm thick PDDA/(PSS/LDH) 25 layer. Further increases in the interphase thickness resulted in a relative drop of the IFSS and DLR, most likely due to a reduction of the radial clamping force exerted on the fiber by the epoxy matrix, as a result of the compliance of the coating.…”

Section: Resultsmentioning

confidence: 93%

Increasing carbon fiber composite strength with a nanostructured “brick-and-mortar” interphase

et al. 2018

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Registered charity number: 207890 rsc.li/materials-horizons Showcasing a nacre-nanomimetic structure conformally deposited around the circumference of multiple carbon fibres by layer-by-layer assembly by researchers at Imperial College London. Artwork designed and created by Eloise De Luca.Increasing carbon fiber composite strength with a nanostructured "brick-and-mortar" interphase Toughening mechanisms occurring in nacre, such as crack deflection and platelet interlocking mechanisms, were reproduced in a nanomimetic coating. The coating was transferred onto the modified surface of carbon fibre tows for use as an interphase. Impregnated fibre tow model composites demonstrated increases in absolute tensile strength and strain-to-failure, as compared to composites containing conventionally sized fibres. As featured in:See an optimized ''brick-and-mortar'' nanostructured interphase was developed, in order to absorb energy at fiber breaks and alleviate local stress concentrations whilst maintaining effective load transfer. The coating was designed to exploit crack bifurcation and platelet interlocking mechanisms known in natural nacre. However, the architecture was scaled down by an order of magnitude to allow a highly ordered conformal coating to be deposited around conventional structural carbon fibers, whilst retaining the characteristic phase proportions and aspect ratios of the natural system.Drawing on this bioinspiration, a Layer-by-Layer assembly method was used to coat multiple fibers simultaneously, providing an efficient and potentially scalable route for production. Single fiber pull-out and fragmentation tests showed improved interfacial characteristics for energy absorption and plasticity. Impregnated fiber tow model composites demonstrated increases in absolute tensile strength (+15%) and strain-to-failure (+30%), as compared to composites containing conventionally sized fibers.

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Section: Resultsmentioning

confidence: 93%

Increasing carbon fiber composite strength with a nanostructured “brick-and-mortar” interphase

et al. 2018

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“…[50,53,54] The method involves embedding a single fiber using an in-house embedding device (detailed in SI S5), ca. 100 µm into a liquid epoxy resin filled aluminum screw followed by a cure cycle.…”

Section: Characterization Of Model Single Fiber Compositesmentioning

confidence: 99%

Continuous carbon nanotube synthesis on charged carbon fibers

Anthony

Sui

Kellersztein

et al. 2018

Composites Part A: Applied Science and Manufacturing

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Carbon nanotube grafted carbon fibers (CNT-g-CFs) were prepared continuously, spool to spool, via thermal CVD. The application of an in-situ potential difference (300 V), between the fibers and a cylindrical graphite foil counter electrode, enhanced the growth, producing a uniform coverage of carbon nanotubes with diameter ca. 10 nm and length ca. 125 nm. Single fiber tensile tests show that this approach avoids the significant reduction of the underlying carbon fiber strengths, which is usually associated with CVD grafting processes. Single fiber fragmentation tests in epoxy, with in-situ video fragment detection, demonstrated that the CNT-g-CFs have the highest interfacial shear strength reported for such systems (101 ± 5 MPa), comparable to state-of-the-art sizing controls (103 ± 8 MPa).Single fiber pull-out data show similar trends. The short length of the grafted CNTs is particularly attractive for retaining the volume fraction of the primary fibers in composite applications.

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“…Any epoxy matrix remaining on the tow is typically found when ductile behaviour is observed, as opposed to a clean, brittle fracture [30]. suggests that the polymer sizing does not aid the interfacial strength of the fibres.…”

Section: Single Tow Pull-out Testsmentioning

confidence: 99%

Development of sizing-free multi-functional carbon fibre nanocomposites

Pozegic

Jayawardena

Chen

et al. 2016

Composites Part A: Applied Science and Manufacturing

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms AbstractHigh quality multi-walled carbon nanotubes (CNTs) grown at high density using a low temperature growth method are used as an alternative material to polymer sizing and is utilised in a series of epoxy composites reinforced with carbon fibres to provide improved physical and electrical properties. We report improvements for sizing-sensitive mechanical and physical properties, such as the interfacial adhesion, shear properties and handling of the fibres, whilst retaining resin-infusion capability. Following fibre volume fraction normalisation, the carbon nanotube-modified carbon fibre composite offers improvements of 146 % increase in Young's modulus; 20% increase in ultimate shear stress; 74 % increase in shear chord modulus and an 83 % improvement in the initial fracture toughness. The addition of CNTs imparts electrical functionalisation to the composite, enhancements in the surface direction are 400%, demonstrating a suitable route to sizing-free composites with enhanced mechanical and electrical functionality.

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Investigation of morphology-dependent fracture behaviour with the single-fibre pull-out test

Cited by 44 publications

References 6 publications

Increasing carbon fiber composite strength with a nanostructured “brick-and-mortar” interphase

Increasing carbon fiber composite strength with a nanostructured “brick-and-mortar” interphase

Continuous carbon nanotube synthesis on charged carbon fibers

Development of sizing-free multi-functional carbon fibre nanocomposites

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