Estimating Methods of Bond Strength between Fiber and Epoxy Matrix in CFRP

Yamashita, Yuichi; Nakao, Kazumune

doi:10.1177/073168449901800906

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Many test techniques for interface adhesion have been reported, including the fragmentation test,11 single‐fiber pullout,12 fiber‐bundle pullout,13 microcompression,14 transverse tensile,15, 16 T‐peel,17 interlaminar shear strength (via a short‐beam three‐point bending test),18 transverse flexural tests,19 and others. As an alternative method, here we introduce a method to determine the fiber–matrix adhesion by measuring the interlaminar shear strength, which is considered to directly indicate the fiber–matrix adhesion strength by keeping a constant V f via an interlaminar shear test according to Chinese National Test Standard GB 1450.1‐83.…”

Section: Methodsmentioning

confidence: 99%

Influence of surface treatment of carbon fibers on interfacial adhesion strength and mechanical properties of PLA-based composites

Wan

Wang

et al. 2001

J. Appl. Polym. Sci.

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In the present study C/PLA composites with different fiber surface conditions (untreated and with nitric acid oxidation for 4 h and 8 h) were prepared to determine the influence of surface treatment on the interfacial adhesion strength and mechanical properties of the composites. A chemical reaction at the fiber–matrix interfaces was confirmed by XPS studies. Nitric acid treatment was found to improve the amount of oxygen‐containing functional groups (particularly the carboxylic group, —COOH) on carbon fiber surfaces and to increase the surface roughness because of the formation of longitudinal crevices. The treated composites exhibited stronger interface adhesion and better mechanical properties in comparison to their untreated counterparts. There was a greater percentage of improvement in interfacial adhesion strength than in the mechanical properties. The strengthened interfaces and improved mechanical performance have been mainly attributed to the greater extent of the chemical reaction between the PLA matrix and the carbon fibers. The increased surface roughness also has had a slight contribution. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 367–376, 2001

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Section: Methodsmentioning

confidence: 99%

Influence of surface treatment of carbon fibers on interfacial adhesion strength and mechanical properties of PLA-based composites

Wan

Wang

et al. 2001

J. Appl. Polym. Sci.

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“…The ILSS has been used for the assessment of bond strength between fiber and matrix resin in a laminated composite. The differences in the thermal expansion coefficients of the fiber and matrix, cure shrinkage in thermosetting matrices result in the development of residual stresses at the fiber-matrix interface [9,10]. The situation may become more complex during thermal fatigue conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermal Shock and Thermal Fatigue on Delamination of Glass-fiber-reinforced Polymeric Composites

Ray

2005

Journal of Reinforced Plastics and Composites

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Glass-fiber-reinforced unsaturated polyester and epoxy resin composites were exposed to 75 C temperature gradient thermal shock for ten times in different stages of conditioning times. The other lot of short-beam shear specimens were conditioned with a thermal shock of again 75 C temperature gradient for the different cycles. The three-point bend test was performed on the conditioned specimens to evaluate the value of interlaminar shear strength. These conditionings may induce matrix cracking because of large misfit strain. The present experiments aim to study the fiber-matrix debonding effect of thermal shock-thermal fatigue, post-curing hardening phenomena of thermal conditioning, and also the mechanical keying factor of sub-zero conditioning.

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Three‐dimensionally braided carbon fiber–epoxy composites, a new type of materials for osteosynthesis devices. II. Influence of fiber surface treatment

Wan

Wang

Zhou

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:Interfacial adhesion between carbon fiber and epoxy resin plays an important role in determining performance of carbon-epoxy composites. The objective of this research is to determine the effect of fiber surface treatment (oxidization in air) on the mechanical properties (flexural strength and modulus, shear and impact strengths) of three-dimensionally (3D) braided carbon-fiber-reinforced epoxy (C 3D /EP) composites. Carbon fibers were air-treated under various conditions to improve fiber-matrix adhesion. It is found that excessive oxidation will cause formation of micropits. These micropits are preferably formed in crevices of fiber surfaces. The micropits formed on fiber surfaces produce strengthened fiber-matrix bond, but cause great loss of fiber strength and is probably harmful to the overall performance of the corresponding composites. A trade-off between the fiber-matrix bond and fiber strength loss should be considered. The effectiveness of fiber surface treatment on performance improvement of the C 3D /EP composites was compared with that of the unidirectional carbon fiberepoxy composites. In addition, the effects of fiber volume fraction (V f ) and braiding angle on relative performance improvements were determined. Results reveal obvious effects of V f and braiding angle. A mechanism was proposed to explain the experimental phenomena.

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Estimating Methods of Bond Strength between Fiber and Epoxy Matrix in CFRP

Cited by 3 publications

References 6 publications

Influence of surface treatment of carbon fibers on interfacial adhesion strength and mechanical properties of PLA-based composites

Influence of surface treatment of carbon fibers on interfacial adhesion strength and mechanical properties of PLA-based composites

Thermal Shock and Thermal Fatigue on Delamination of Glass-fiber-reinforced Polymeric Composites

Three‐dimensionally braided carbon fiber–epoxy composites, a new type of materials for osteosynthesis devices. II. Influence of fiber surface treatment

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