Determination of intrinsic strength of carbon fibers

Sugimoto, Yoshiki; Shioya, Masatoshi; Kageyama, Kazuro

doi:10.1016/j.carbon.2016.01.021

Cited by 16 publications

(4 citation statements)

References 9 publications

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“…[ 26 ] Intrinsic Young's modulus of single CFs in the radius direction have been reported to be around 10 GPa in a preceding work. [ 27 ] The CF tips are stiff enough and the fear of CF tip deformity can be ruled out. When the pristine CF probe touches the EP layer, the CF surface hardly wets with the EP molecules.…”

Section: Resultsmentioning

confidence: 99%

A feasibility study on direct measurements of interaction forces between carbon fiber surfaces and other substances

et al. 2020

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Mechanical properties of carbon fiber (CF) reinforced plastic composites are influenced by physicochemical interactions between CF surfaces and matrix polymers. Poor interfacial adhesion between CF surfaces and matrix polymer molecules caused by inertness of graphitic carbon still remains to be solved. Deeper comprehension of the interfacial properties would promote advancement of technologies enhancing the physicochemical interactions. Versatile methods for evaluation of CF surface properties along with interactions at the CF/polymer interface are required. In the present paper, we propose a method to measure interaction forces between CF surfaces and other substances with the aid of atomic force microscope (AFM). Small CF chips were mounted on AFM cantilevers to measure forces between the CF chip surfaces and other materials. Interaction forces between CF chips with/without ultraviolet generated ozone (UV-ozone) treatment and epoxy precursor molecules were monitored. It has been widely accepted that the UV-ozone treated CF surfaces exhibit superior affinity to organic molecules. Results of the interaction force measurements were consistent with the knowledge. This is the first paper reporting direct measurement of interaction forces between CF surfaces and other substances.

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Section: Resultsmentioning

confidence: 99%

A feasibility study on direct measurements of interaction forces between carbon fiber surfaces and other substances

et al. 2020

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“…Further refinement of calculation of the stress field can be performed by taking account of the anisotropy in the elastic constants for CFs [5]. However, this is not performed in the present study since only the Young modulus was measured among various elastic constants.…”

Section: Discussionmentioning

confidence: 99%

Maximum available tensile strength of carbon fibers

Shioya¹,

Kajikawa²,

Takahashi³

et al. 2018

Adv. Mater. Lett.

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Development of carbon fibers from alternative precursory materials through new production processes is a recent topic of active research. In such a research, the maximum available tensile strength, i. e. the tensile strength which will be achieved after elaboration to suppress defect formation during production process, is the matter of great concern. We have developed a method for determining this strength through the tensile test on a single fiber after introducing an artificial notch. In the present paper, this method has been refined. By using the refined method, the distribution of the maximum available tensile strength at various radial positions has been measured for a polyacrylonitrile-based carbon fiber. The difference between the maximum available tensile strength and the strength predicted using other methods such as those based on the fracture toughness and the fiber-length dependence of the tensile strength has also been discussed.

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“…• The fibre element strength is calculated by extrapolating the Weibull strength distribution to a very short length (7 µm), corresponding to the element size. The extrapolation to such short gauge length is not supported by experimental evidence, and can lead to element strengths that are close to or higher than the theoretical strength of carbon fibres [44]. Better scaling laws should be used to correct the model, but they are difficult to obtain experimentally [45].…”

Section: Stress-strain Responsementioning

confidence: 96%