Interface in composite materials

doi:10.1098/rsta.1980.0059

Cited by 93 publications

(13 citation statements)

References 11 publications

(12 reference statements)

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“…They felt that the improvement in bonding was due to the chemisorption of the amine hardener on the carboxylic acid groups. Ehrburger and Donnet 34 have reported similar results for oxidized fibers and epoxy composites.…”

Section: Effect Of Oxidative Treatments On Composite Propertiessupporting

confidence: 74%

Surface Treatment of Carbon Fibers Using Low Temperature Plasma

Vaidyanathan

Kabadi

Vaidyanathan

et al. 1995

The Journal of Adhesion

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Low temperature plasma treatment experiments were conducted on AS4 and AU4 type fibers in the presence of air, argon and nitrogen to study their effects on the resulting fiber-matrix adhesion in the composites fabricated with the fibers. Optimum conditions for the introduction of maximum surface oxygen and nitrogen functional groups on AS4 and AU4 fiber surfaces were derived. X-ray photelectron spectroscopy was performed on the fiber surfaces to determine the effect of plasma treatment on the amount and types of surface functional groups introduced. Scanningelectron microscopy was performed on the fiber surfaces and the amount of surface etching and pitting was correlated to the plasma treatment conditions. Transverse tensile specimens were fabricated from treated fibers representing a few plasma treatment conditions, and their transverse tensile strengths were measured experimentally. An attempt was made to determine the effects offactors such as amount ofchemical groups on the fiber surfaces, mechanical interlocking, molecular level entanglement and physical interactions to explain the data. KEY WORDS matrix adhesion; transverse tensile strength.Low temperature plasma; carbon fibers; composites; surface functional groups; fiber- INTRODUCTIONThe technological demand for materials that exhibit improved specific strength and stiffness characteristics has led to considerable research and development in the field of fiber-reinforced resin-matrix composites. When fibers such as carbon, boron, and glass are combined with various epoxy, polyester, and polyamide resins, they produce a class of materials possessing specific tensile properties that can exceed those of the best metal alloys currently in production, depending on the fiber-matrix combination. By using specific combinations of fiber and matrix, it is possible to tailor structural materials that are superior for specific applications.Among the types of fibers, carbon is used for large-volume commercial applications based on three significant advantages. They are a) stiffer, b) lighter, and c) corrosion resistant in certain environments where glass fibers are vulnerable. However, the Downloaded by [North Carolina State University] at 21:19 09 April 2015 2 N. P. VAIDYANATHAN et al.potential for carbon fiber reinforced composites is limited by their low transverse mechanical properties that are directly attributed to the poor adhesion between the fibers and the matrix. The adhesion between untreated carbon fibers and epoxy matrices has generally been poor. Therefore, it is important that the fiber surface have certain qualities that enhance its adhesion, which are: a) a large external surface area free from superficial defects, b) a high degree of roughness, and c) sufficient number of surface functional groups.,The objective of this work was to study the effect of low temperature plasma treatment of carbon fibers on the enhancement of surface oxygen and nitrogen functional groups on AS4 and A U 4 type carbon fibers. Initial studies were also conducted to examine...

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Section: Effect Of Oxidative Treatments On Composite Propertiessupporting

confidence: 74%

Surface Treatment of Carbon Fibers Using Low Temperature Plasma

Vaidyanathan

Kabadi

Vaidyanathan

et al. 1995

The Journal of Adhesion

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“…2, all f i0 are correlated with the respective ILSS. As expected [47,48], interfacial free volume increase is accompanied by a corresponding decrease of the interlaminar shear strength in the composite, with the silane-treated fibers providing the best performance and the PDMScoated ones the worse.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 63%

Evaluation of interfacial relaxation due to water absorption in fiber–polymer composites

Tsenoglou

Pavlidou

Papaspyrides

2006

Composites Science and Technology

166

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“…The mechanism of stress transfer at the fibre-matrix interface strongly influences the ability of short fibres to reinforce composite materials [1]. During initial load-76 K. L. Goh et al / Composite Interfaces 17 (2010) [75][76][77][78][79][80][81] ing, when a low applied force acts on the composite, the matrix deforms elastically [2,3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Fibre Taper on the Interfacial Shear Stress in Fibre-Reinforced Composite Materials during Elastic Stress Transfer

Goh

Meakin

Hukins

2010

Composite Interfaces

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The paper is concerned with finite element (FE) analysis of stress transfer from an elastic matrix to an elastic fibre, which need not be a uniform cylinder, in a fibre-reinforced composite material. Axisymmetric models of fibres embedded in co-axial cylindrical matrices were investigated by the FE method. Fibre shapes investigated were cylindrical, ellipsoidal, paraboloidal taper and conical taper. The effects of varying the fibre aspect ratio, q (ranging 200 to 3500) and Young's modulus (relative to that of the matrix), E f /E m (ranging 10 3 to 10 6 ) were investigated. The results show that ellipsoidal and parabolic tapers lead to a similar distribution of interfacial shear stress (τ ) to that observed for a uniform cylindrical fibre, except that the magnitude of the stress is higher. For a conical taper (except for q = 200, E f /E m = 10 6 ), the interfacial stress increases to a maximum between the centre and the end of the fibre and then decreases towards the fibre ends. The effect of fibre taper on the distribution of τ values is reflected in the axial tensile stress, σ z , distribution induced in a fibre. For example, for a fibre with a conical taper, the distribution of τ values can lead to an even distribution of σ z along the length of a fibre.

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Interface in composite materials

Cited by 93 publications

References 11 publications

Surface Treatment of Carbon Fibers Using Low Temperature Plasma

Surface Treatment of Carbon Fibers Using Low Temperature Plasma

Evaluation of interfacial relaxation due to water absorption in fiber–polymer composites

Influence of Fibre Taper on the Interfacial Shear Stress in Fibre-Reinforced Composite Materials during Elastic Stress Transfer

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