The design of the fibre-matrix interfacial zone in ceramic matrix composites

Naslain, R.

doi:10.1016/s1359-835x(97)00128-0

Cited by 303 publications

(133 citation statements)

References 57 publications

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“…However, logically, further improvements could be achieved by improving the degree of order of the nanosheets in the interphase; indeed, recent modelling work has shown that a welldefined, layered interphase is needed to improve composite toughness via multiple crack deflection. 24 In the context of brittle ceramic matrix composites, where the focus is on toughening, a layered coating of pyrocarbon or boron nitride has been found to be especially effective for crack deflection and stress relaxation, both experimentally 25,26 and numerically. 27 However, for FRPs, simple crack deflection at a weak interface is not sufficient; new approaches are needed to create composite interfaces, which allow composite strength and toughness to be improved simultaneously.…”

Section: Conceptual Insightsmentioning

confidence: 99%

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: Conceptual Insightsmentioning

confidence: 99%

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

et al. 2018

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“…It is well known that fiber/matrix bonding is a key factor controlling performances of ceramic matrix composites, a pyrocarbon interphase (PyC i ) was deposited on the fiber surface from gaseous precursor in order to arrest and deflect the matrix microcracks and to insure a load transfer function [29,30]. …”

Section: Fiber Preforms and Interphasesmentioning

confidence: 99%

Fiber-reinforced ceramic matrix composites processed by a hybrid technique based on chemical vapor infiltration, slurry impregnation and spark plasma sintering

Magnant

Pailler

Petitcorps

et al. 2013

Journal of the European Ceramic Society

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“…The formation of an interphase depends directly on the chemical, mechanical and thermo-dynamical natures of the bonding process between fibers and matrix, which leads to spatially non-uniform properties of interphase in the thickness direction (Hughes, 1991;Gao and Mader, 2002;Liu et al, 2008;Naslain, 1998;Zhang et al, 2010). The size of an interphase region is rather small (at sub-microscopic scale) and experimental tests of the interfacial characteristics should be affected by many factors, such as the specimen geometries and fiber volume fractions (Atkins, 1975;Hughes, 1991;Liu et al, 2008;Zhang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

The effect of a graded interphase on the mechanism of stress transfer in a fiber-reinforced composite

Yin

Chen

2013

Mechanics of Materials

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a b s t r a c tBased on an improved shear-lag model, the effect of an inhomogeneous interphase on the mechanism of stress transfer in fiber-reinforced composites is investigated. The inhomogeneity of the interphase is represented by the graded feature of the Young's modulus varying according to a power law or a linear one in the radius direction, while the Poisson's ratio and thermal expansion coefficient are assumed to be constants. Considering the effects of the inhomogeneous interphase as well as the Poisson's contraction and thermal residual stress, closed-form solutions to the axial fiber stress and interfacial shear stress are obtained analytically. Comparing the case with a power law to that with a linear one, we find that the fiber stress increases significantly in the former case, while it decreases slightly in the latter one with an increasing interphase thickness. With the same external tensile load and interphase thickness, it is found that the fiber in the power law case is subjected to a larger tensile stress than that in the linear variation one. However, the interfacial shear stress is not sensitive to the interphase thickness in both cases, except that near the two ends of fiber. Under the same external load, the maximum shear stress in the interphase is much smaller in the latter than that in the former. All the phenomena can be characterized by one parameter, i.e., the average Young's modulus of interphase, and denote that an interphase with a power variation law is more effective for stress transfer while the linearly graded one is more advantageous to avoid shear failure. The results should be helpful for engineers to properly design the interphase in novel composites, e.g. a carbon-fiber reinforced epoxy one.

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The design of the fibre-matrix interfacial zone in ceramic matrix composites

Cited by 303 publications

References 57 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

Fiber-reinforced ceramic matrix composites processed by a hybrid technique based on chemical vapor infiltration, slurry impregnation and spark plasma sintering

The effect of a graded interphase on the mechanism of stress transfer in a fiber-reinforced composite

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