Carbon Fiber Content

It is important to check the extensometer knife edges for damage and to ensure that no additional load is applied by the weight of the extensometer cable, which is best supported with a magnetic clip attached to the metal frame of the testing machine. If wedge action grips are used, make certain that the shear pins are intact. 

The extensometer can be calibrated with a drum micrometer and it is important that the anvils onto which the extensometer is attached are soft metal, such as mild steel, and not chrome plated, since the extensometer would not be able to bite in sufficiently to prevent slippage. 

Adjustable guide sleeve. Carbide cutting tooi 

Mode of f luie of tensile composite specimens made from different types of Grafil  

When breaking tensile specimens, the operator should be protected against flying debris with a protective screen, which can be a sliding window attached to the frame of the test machine. 

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Fig. 2.18 illustrates the nature of the intensity profiles in pure polyetheretherke-tone (PEEK) and carbon fiber reinforced PEEK composites in the transmission and reflection modes, respectively. The quenched amorphous and slowly cooled crystalline components from PEEK can be separated. The three prominent diffraction peaks from the crystalline components in Fig. 2.18(a) correspond to the three uniform rings which can be detected in X-ray photographs. In contrast, no clearly measurable signal is identified from the PEEK amorphous phase independent of the carbon fiber content. 

Mix no. Cement silica fume FRP powder (by mass) Shirasu balloon content (wt% ) HPMC content (wt% ) Super- plasticizer content (wt% ) Carbon fiber content (vol%) Water-(cement + silica fume) ratio (%) Air content (%) Flow... 

Figure 3 shows the carbon fiber content vs. water-(cement+silica fume) ratio of fresh artificial woods with flows of 170 5. As seen in the figure, the water requirement for the given consistency of the fresh artificial woods increases with an increase in the carbon fiber content regardless of the HPMC content and shirasu balloon content. The water requirement increases slightly with raising HPMC content from 0.4 to 0.8wt% irrespective of the carbon fiber content and shirasu balloon content. The inclusion of 14wt% shirasu balloon in the artificial woods causes an increase in the water requirement. 

Fig. 3 Carbon fiber content vs. water— (cement+silica fume) ratio of artificial woods.

Figure 5 represents the flexural load-deflection curves for artificial woods. In general, the maximum flexural load of the artificial woods tends to increase with an increase in carbon fiber content, and the deflection at the maximum flexural load increases with increasing shirasu balloon content and HPMC content. A drop in the post-maximum flexural load shows a more ductile behavior with raising HPMC content from 0.4 to 0.8wt%. From the above-mentioned results, the flexural deformation behavior of the artificial woods is markedly improved by using carbon fibers, HPMC and shirasu balloon. 

Figure 8 exhibits the carbon fiber content vs. compressive strength of artificial woods. The compressive strength of the artificial woods decreases with increasing in the carbon fiber content, HPMC content and shirasu balloon content. Such compressive strength decrease may be explained by increases in both water-(cement+silica fume) ratio and voids in the artificial woods according to the water-cement ratio theory and voids theory, and is expressed by the following empirical equation ... 

Figure 11 illustrates the carbon fiber content vs. hardness of artificial woods. The hardness of the artificial woods decreases with increases in the carbon fiber content, HPMC content and shirasu balloon content. 

Shirasu balloon content (wt% of cement+silica fume) 14 HPMC content (wt% of cement+silica fume) 0.8 Superplasticizer content (wt% of cement+silica fume) 2.0 Carbon fiber content (vol%) 2 to 4... 

The mix proportions of artificial woods which can be nailed are recommended in 4. From an economical viewpoint, the carbon fiber content in the mix proportions can be reduced to 2 vol%. The optimum mix proportions with a carbon fiber content of 2 vol% is given in Table 7. The bulk specific gravity, flexural and compressive strengths of an artificial wood with the optimum mix proportions are 0.9, 12.0MPa and 19.0MPa respectively. The artificial wood also has good wood-processability like natural wood. 

Further analysis of carbon fiber content in the composites (Fig. 2) shows that F/decreases linearly with VzrB2 increase, and this decrease causes decrease of flexural strength and modulus, showing that in the composites both SiC matrix and ZrB2 matrix contribute only integral of the composites, and carbon fiber contributes mainly both strength and modulus. 

Figure 2. The mechanical properties of samples with different carbon fiber content...

Work at Courtaulds [22,23] in the early 1970s attempted to incorporate carbon fiber in a cement slurry, which was difficult due to the size of the cement particles. They tended to be filtered out by the fiber reinforcement, so a cement with a fine particle size (Swiftcrete, an ultra rapid hardening Portland cement with a maximum diameter of about 45 pm) was used and the fiber spread as thinly as possible, using either an air knife, or a water flume and then held in the spread position by sizing with a water based compatible size such as sodium carboxymethylcellulose [22,23]. These larger particles limit the carbon fiber content to about 5% v/v, but in practice, due to a non-uniform distribution, a value of some 12% v/v was attainable. 

Carbon fiber as the conductive material—high carbon fiber content (30 - 40% w/w) will provide... 

In thermoplastics, carbon fiber compounds have been developed with nylon, polysulfone, thermoplastic, polyester, polyphenylene sulfide, polycarbonate, polypropylene, polyamide-imide, and ethylene/tetrafluoroethylene copolymer. Carbon fiber-reinforced molding compounds are available with carbon fiber contents of various levels such as 20, 30, and 40 weight percent. Nylon 66 molding compounds have also been developed with hybrid combinations of carbon and glass fiber reinforcements. 

DOP dioctyl phthalate CFa carbon fiber content = a mass%, e.g. 

Figure 4.2. Variation of flexural strength with carbon fiber content for phenolic resin filled with pristine ( ), nitric acid modified- (O) and coupling agent treated- (a) SCFs [21]...

On the other hand, more fiber volume fractions and well designed and prepared interphases can also dramatically increase the mechanical properties of the composite A high bending tensile strength of 325 MPa of a 2D composite with T300 carbon fiber volume fraction of 42.5% and 557 MPa for a 3D woven composite with a similar fiber content have been reported As a comparison the carbon fiber content of the used 2D preform in this study is as low as 17.6%. Huge influence of... 

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