Modelling the efficiency of strain transfer across an interphase region in fibre reinforced composites

Lane, Ryan J.; Hayes, Shannon; Jones, Frank R.

doi:10.1163/156855499x00125

Cited by 12 publications

(3 citation statements)

References 13 publications

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“…Broutman and Agarwal found out that a good combination of tensile strength and toughness may be expected with an interlayer modulus of about one tenth that of the matrix. Lane et al [8], using an axisymmetric finite-element model of a short GF composite, showed that the ideal composite system should consist of an interphase that is slightly less ductile than the matrix. Even though we do not know fully in advance which coating material is most suitable for a specific composite system, the variables that affect the properties of FRP have been identified as follows: interlayer modulus, interlayer thickness, matrix modulus, coating material (composition), and interaction at the interfaces [6].…”

Section: Interlayer As a Functional Nanostructurementioning

confidence: 99%

Plasma Polymer Film as a Model Interlayer for Polymer Composites

Čech

2006

IEEE Trans. Plasma Sci.

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In this paper, a plasma-enhanced chemical vapor deposition process that is useful for the preparation of thin and ultrathin films of controlled mechanical properties is identified. Plasma-polymerized films of vinyltriethoxysilane were deposited on planar substrates and analyzed using nanoindentation measurements of the Young's modulus of the films, adhesion bonding at the film/glass interface, chemical composition, and structure. The modulus of the plasma polymer film can be controlled simply by the effective power fed into the capacitive-coupled low-pressure plasma. The single film was tested as an interlayer in glass fiber (GF)/polyester composites. GF bundles were surface modified by plasma polymer in a unique technological system, enabling continuous processing of the bundle. GF/polyester composites in the form of short beams were manufactured using the coated fibers and tested according to the standard test method. By increasing the interlayer modulus, the short-beam strength was enhanced up to 112% compared with the untreated GFs, and this enhancement was also supported by an improvement in interfacial bonding. Index Terms-Glass fiber (GF), interface/interphase, mechanical properties, plasma-enhanced chemical vapor deposition (PE CVD), thin film.

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Section: Interlayer As a Functional Nanostructurementioning

confidence: 99%

Plasma Polymer Film as a Model Interlayer for Polymer Composites

Čech

2006

IEEE Trans. Plasma Sci.

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“…They are highly cross-linked polymers and as a result will have a modulus not dissimilar to the matrix and probably higher. In recent FE modelling studies [31,32] with perfectly bonded ®bres, yieldable coatings of this thickness have been shown to in¯u-ence stress transfer. However, in these studies debonding was the main interfacial phenomenon observed, demonstrating that yielding in the plasma polymer interphase will not make a signi®cant contribution.…”

Section: The Assessment Of Interfacial Adhesionmentioning

confidence: 99%

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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“…A ductile interphase can yield and protect the fiber from crack propagation in the matrix, thereby saving the composite from premature fracture. Therefore, a proper balance between interphase stiffness and ductility is critical for optimizing the design of composites with the desired mechanical properties [19]. Furthermore, the interphase thickness plays a major role in the rate of stress transfer from the matrix to the fiber [20].…”

Section: Introductionmentioning

confidence: 99%

Nanoscale characterization of interphase properties in maleated polypropylene‐treated natural fiber‐reinforced polymer composites

Nair

Hurley

Wang

et al. 2012

Polymer Engineering & Sci

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Contact resonance force microscopy has been used to evaluate the effect of maleated polypropylene (MAPP) concentration on interphase thickness as well as the spatial distribution of mechanical properties within the interphase of cellulose fiber‐reinforced polypropylene composites. The average interphase thickness values ranged from 25 nm to 104 nm for different concentrations of MAPP. The interphase region showed a gradient in the elastic modulus, with a gradual decrease in modulus from fiber to matrix. The interphase region in the specimen containing 0% MAPP showed a narrow interphase with steep gradient in modulus from fiber to matrix, whereas the use of MAPP significantly increased the interphase thickness which resulted in a more gradual change in modulus from fiber to matrix. POLYM. ENG. SCI., 2013. © Society of Plastics Engineers

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Modelling the efficiency of strain transfer across an interphase region in fibre reinforced composites

Cited by 12 publications

References 13 publications

Plasma Polymer Film as a Model Interlayer for Polymer Composites

Plasma Polymer Film as a Model Interlayer for Polymer Composites

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

Nanoscale characterization of interphase properties in maleated polypropylene‐treated natural fiber‐reinforced polymer composites

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