The effects of fibre surface coatings on the mechanical properties of CFRP

Hancox, N.L.; Wells, Hannah C.

doi:10.1016/0015-0568(77)90025-2

Cited by 55 publications

(18 citation statements)

References 10 publications

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“…Many investigators have been attracted to pursue better mechanical properties for different types of CFRPs. [17][18][19][20][21] CFRPs are often used together with other engineering metals, such as steels, Al alloys, Mg alloys and Ti alloys in industry. 14,15,22,23 As carbon has an open-circuit-potential (OCP) more positive than most engineering metals, strong galvanic cells can be formed between CFRPs and these metals in aggressive service environments, [24][25][26][27] thus galvanic corrosion of the coupled metals has been always a big concern.…”

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Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

Zhang

Zheng

Song

et al. 2018

J. Electrochem. Soc.

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Carbon fiber reinforced epoxy and nylon were measured by means of potentiodynamic polarization, potentiostatic polarization and AC electrochemical impedance spectroscopy (EIS) in a solution containing 0.9wt% NaCl, 0.1wt% CaCl 2 and 0.075wt% NaHCO 3 . Their microstructures were examined by SEM. The results showed that these two types of carbon fiber reinforced polymers (CFRPs) were electrically conductive and electrochemically noble, and exhibited different EIS characteristics. Strong anodic and cathodic polarization could damage their surface polymer layers. Based on their different microstructures and electrochemical behaviors, a surface polymer layer model was proposed for these CFRPs. and aerospace 16 industries due to its light weight, high stiffness, high strength, good anti-fatigue performance and excellent corrosion resistance. Many investigators have been attracted to pursue better mechanical properties for different types of CFRPs. [17][18][19][20][21] CFRPs are often used together with other engineering metals, such as steels, Al alloys, Mg alloys and Ti alloys in industry. 14,15,22,23 As carbon has an open-circuit-potential (OCP) more positive than most engineering metals, strong galvanic cells can be formed between CFRPs and these metals in aggressive service environments, 24-27 thus galvanic corrosion of the coupled metals has been always a big concern.In the past decades, many studies have been focused on the galvanic effect of CFRPs on the coupled metals, including the influence of metallurgical and environmental factors on the galvanic corrosion. 10,25,[28][29][30][31] These have led to some common knowledge. For example, it has been generally accepted that, apart from the wellknown galvanic corrosion of steels caused by CFRPs, aluminum alloys with good general corrosion resistance, can also suffer from galvanic corrosion if they are coupled with CFRPs. 24,32 The galvanic corrosion of magnesium alloys coupled with CFRPs is more severe than any other engineering metals.26 Titanium alloys are stable in most aggressive environments and not attacked by galvanic corrosion if they are in contact with CFRPs. 27,33 However, most of these studies simply measured or estimated the corrosion damage of metals. They ignored the detailed electrochemical behavior of the coupled CFRPs. 26,32,34 In fact, the metal in contact with a CFRP may deteriorate more severely due to crevices formed in the joint than that simply caused by galvanic effect. On the other hand, the CFRP in a galvanic couple may also degrade and its electrochemical properties may vary with time while the coupled metal is being corroded, as the corrosion products from the coupled metal may in return affect the electrochemical performance or even accelerate the degradation of the CFRP. This kind of possible degradation of a CFRP in a galvanic couple, as well as the detrimental effect of the CFRP degradation on the galvanic corrosion of a coupled metal, has not been systematically investigated.In fact, CFRP can degrade in a corrosive medium chemical...

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Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

Zhang

Zheng

Song

et al. 2018

J. Electrochem. Soc.

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“…However, it appears that on physical considerations an increase in stiffness with the introduction of soft coatings is unexplicable, whereas the trends of our curves seem logical. Although impact tests are convenient in evaluating the fracture energy of a notched three-dimensional fiber composite [4], it remains impossible to accurately measure the developed instantaneous strain-rates in the composite during fracture initiation, due to impact. In Fig.…”

Section: Resultsmentioning

confidence: 99%

The effect of coating on the stiffness and toughness of encapsulated fiber composites

Theocaris

Demakos

1988

Colloid & Polymer Sci

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The effect of the coating of the fiber on the stiffness and toughness of composite materials is presented in this paper. The type of composite material considered is of a macroscopically isotropic composite medium containing coated fibers. The models used to simulate such materials consists of: the cylindrical fiber, a cylindrical annulus of the coating, an annulus of the matrix enveloped by an infinite region of an equivalent composite consisting of a transversely isotropic material and representing the real composite with dispersed coated fibers. Solutions for the longitudinal, transverse and shear elastic moduli in the four-phase model were established assuming linear elastic conditions. The results were found to depend on the extent and the mechanical properties of the coating. The stiffness and toughness of the composite were evaluated in models representing plane-stress equatorial sections of the representative volume element of the real material according to the Hashin-Rosen model. The stiffness of the fiber composites was studied by varying the rigidity and the extent of the fiber-coating in the model and evaluating its influence on the overall mechanical behavior of the model. On the other hand, the toughness of the composite was evaluated by the method of caustics in models made of composite PMMA plates with PMMA inclusions coated with a ductile annulus. Interesting results were derived concerning the influence of the soft annulus on the mechanical behavior of the composite.

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“…The polymer forms an interlayer phase that is capable of chemical bonding to both the fiber and the matrix. By using a flexible interlayer as a stress damper, the energy absorption capability of the composite can be significantly increased (Hancox and Wells, 1977). Reiss et al (1974) used a polymer coating that served the dual purposes of a flexible interlayer and a chemical bonding agent.…”

Section: Surface Treatment Of Carbon Fibersmentioning

confidence: 99%

Fibers and Whiskers

Parvizi‐Majidi

2006

Materials Science and Technology

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The effects of fibre surface coatings on the mechanical properties of CFRP

Cited by 55 publications

References 10 publications

Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

The effect of coating on the stiffness and toughness of encapsulated fiber composites

Fibers and Whiskers

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